Complete documentation of packed arrays

9 files changed, 74 insertions, 2 deletions

diff --git a/doc/classes/PackedByteArray.xml b/doc/classes/PackedByteArray.xml
index b02333667d..efb559522a 100644
--- a/doc/classes/PackedByteArray.xml
+++ b/doc/classes/PackedByteArray.xml
@@ -5,6 +5,7 @@
 	</brief_description>
 	<description>
 		An array specifically designed to hold bytes. Packs data tightly, so it saves memory for large array sizes.
+		[PackedByteArray] also provides methods to encode/decode various types to/from bytes. The way values are encoded is an implementation detail and shouldn't be relied upon when interacting with external apps.
 	</description>
 	<tutorials>
 	</tutorials>
@@ -78,66 +79,77 @@
 			<return type="float" />
 			<param index="0" name="byte_offset" type="int" />
 			<description>
+				Decodes a 64-bit floating point number from the bytes starting at [param byte_offset]. Fails if the byte count is insufficient. Returns [code]0.0[/code] if a valid number can't be decoded.
 			</description>
 		</method>
 		<method name="decode_float" qualifiers="const">
 			<return type="float" />
 			<param index="0" name="byte_offset" type="int" />
 			<description>
+				Decodes a 32-bit floating point number from the bytes starting at [param byte_offset]. Fails if the byte count is insufficient. Returns [code]0.0[/code] if a valid number can't be decoded.
 			</description>
 		</method>
 		<method name="decode_half" qualifiers="const">
 			<return type="float" />
 			<param index="0" name="byte_offset" type="int" />
 			<description>
+				Decodes a 16-bit floating point number from the bytes starting at [param byte_offset]. Fails if the byte count is insufficient. Returns [code]0.0[/code] if a valid number can't be decoded.
 			</description>
 		</method>
 		<method name="decode_s16" qualifiers="const">
 			<return type="int" />
 			<param index="0" name="byte_offset" type="int" />
 			<description>
+				Decodes a 16-bit signed integer number from the bytes starting at [param byte_offset]. Fails if the byte count is insufficient. Returns [code]0[/code] if a valid number can't be decoded.
 			</description>
 		</method>
 		<method name="decode_s32" qualifiers="const">
 			<return type="int" />
 			<param index="0" name="byte_offset" type="int" />
 			<description>
+				Decodes a 32-bit signed integer number from the bytes starting at [param byte_offset]. Fails if the byte count is insufficient. Returns [code]0[/code] if a valid number can't be decoded.
 			</description>
 		</method>
 		<method name="decode_s64" qualifiers="const">
 			<return type="int" />
 			<param index="0" name="byte_offset" type="int" />
 			<description>
+				Decodes a 64-bit signed integer number from the bytes starting at [param byte_offset]. Fails if the byte count is insufficient. Returns [code]0[/code] if a valid number can't be decoded.
 			</description>
 		</method>
 		<method name="decode_s8" qualifiers="const">
 			<return type="int" />
 			<param index="0" name="byte_offset" type="int" />
 			<description>
+				Decodes a 8-bit signed integer number from the bytes starting at [param byte_offset]. Fails if the byte count is insufficient. Returns [code]0[/code] if a valid number can't be decoded.
 			</description>
 		</method>
 		<method name="decode_u16" qualifiers="const">
 			<return type="int" />
 			<param index="0" name="byte_offset" type="int" />
 			<description>
+				Decodes a 16-bit unsigned integer number from the bytes starting at [param byte_offset]. Fails if the byte count is insufficient. Returns [code]0[/code] if a valid number can't be decoded.
 			</description>
 		</method>
 		<method name="decode_u32" qualifiers="const">
 			<return type="int" />
 			<param index="0" name="byte_offset" type="int" />
 			<description>
+				Decodes a 32-bit unsigned integer number from the bytes starting at [param byte_offset]. Fails if the byte count is insufficient. Returns [code]0[/code] if a valid number can't be decoded.
 			</description>
 		</method>
 		<method name="decode_u64" qualifiers="const">
 			<return type="int" />
 			<param index="0" name="byte_offset" type="int" />
 			<description>
+				Decodes a 64-bit unsigned integer number from the bytes starting at [param byte_offset]. Fails if the byte count is insufficient. Returns [code]0[/code] if a valid number can't be decoded.
 			</description>
 		</method>
 		<method name="decode_u8" qualifiers="const">
 			<return type="int" />
 			<param index="0" name="byte_offset" type="int" />
 			<description>
+				Decodes a 8-bit unsigned integer number from the bytes starting at [param byte_offset]. Fails if the byte count is insufficient. Returns [code]0[/code] if a valid number can't be decoded.
 			</description>
 		</method>
 		<method name="decode_var" qualifiers="const">
@@ -145,6 +157,7 @@
 			<param index="0" name="byte_offset" type="int" />
 			<param index="1" name="allow_objects" type="bool" default="false" />
 			<description>
+				Decodes a [Variant] from the bytes starting at [param byte_offset]. Returns [code]null[/code] if a valid variant can't be decoded or the value is [Object]-derived and [param allow_objects] is [code]false[/code].
 			</description>
 		</method>
 		<method name="decode_var_size" qualifiers="const">
@@ -152,6 +165,7 @@
 			<param index="0" name="byte_offset" type="int" />
 			<param index="1" name="allow_objects" type="bool" default="false" />
 			<description>
+				Decodes a size of a [Variant] from the bytes starting at [param byte_offset]. Requires at least 4 bytes of data starting at the offset, otherwise fails.
 			</description>
 		</method>
 		<method name="decompress" qualifiers="const">
@@ -183,6 +197,7 @@
 			<param index="0" name="byte_offset" type="int" />
 			<param index="1" name="value" type="float" />
 			<description>
+				Encodes a 64-bit floating point number as bytes at the index of [param byte_offset] bytes. The array must have at least 8 bytes of allocated space, starting at the offset.
 			</description>
 		</method>
 		<method name="encode_float">
@@ -190,6 +205,7 @@
 			<param index="0" name="byte_offset" type="int" />
 			<param index="1" name="value" type="float" />
 			<description>
+				Encodes a 32-bit floating point number as bytes at the index of [param byte_offset] bytes. The array must have at least 4 bytes of space, starting at the offset.
 			</description>
 		</method>
 		<method name="encode_half">
@@ -197,6 +213,7 @@
 			<param index="0" name="byte_offset" type="int" />
 			<param index="1" name="value" type="float" />
 			<description>
+				Encodes a 16-bit floating point number as bytes at the index of [param byte_offset] bytes. The array must have at least 2 bytes of space, starting at the offset.
 			</description>
 		</method>
 		<method name="encode_s16">
@@ -204,6 +221,7 @@
 			<param index="0" name="byte_offset" type="int" />
 			<param index="1" name="value" type="int" />
 			<description>
+				Encodes a 16-bit signed integer number as bytes at the index of [param byte_offset] bytes. The array must have at least 2 bytes of space, starting at the offset.
 			</description>
 		</method>
 		<method name="encode_s32">
@@ -211,6 +229,7 @@
 			<param index="0" name="byte_offset" type="int" />
 			<param index="1" name="value" type="int" />
 			<description>
+				Encodes a 32-bit signed integer number as bytes at the index of [param byte_offset] bytes. The array must have at least 2 bytes of space, starting at the offset.
 			</description>
 		</method>
 		<method name="encode_s64">
@@ -218,6 +237,7 @@
 			<param index="0" name="byte_offset" type="int" />
 			<param index="1" name="value" type="int" />
 			<description>
+				Encodes a 64-bit signed integer number as bytes at the index of [param byte_offset] bytes. The array must have at least 2 bytes of space, starting at the offset.
 			</description>
 		</method>
 		<method name="encode_s8">
@@ -225,6 +245,7 @@
 			<param index="0" name="byte_offset" type="int" />
 			<param index="1" name="value" type="int" />
 			<description>
+				Encodes a 8-bit signed integer number (signed byte) at the index of [param byte_offset] bytes. The array must have at least 1 byte of space, starting at the offset.
 			</description>
 		</method>
 		<method name="encode_u16">
@@ -232,6 +253,7 @@
 			<param index="0" name="byte_offset" type="int" />
 			<param index="1" name="value" type="int" />
 			<description>
+				Encodes a 16-bit unsigned integer number as bytes at the index of [param byte_offset] bytes. The array must have at least 2 bytes of space, starting at the offset.
 			</description>
 		</method>
 		<method name="encode_u32">
@@ -239,6 +261,7 @@
 			<param index="0" name="byte_offset" type="int" />
 			<param index="1" name="value" type="int" />
 			<description>
+				Encodes a 32-bit unsigned integer number as bytes at the index of [param byte_offset] bytes. The array must have at least 4 bytes of space, starting at the offset.
 			</description>
 		</method>
 		<method name="encode_u64">
@@ -246,6 +269,7 @@
 			<param index="0" name="byte_offset" type="int" />
 			<param index="1" name="value" type="int" />
 			<description>
+				Encodes a 64-bit unsigned integer number as bytes at the index of [param byte_offset] bytes. The array must have at least 8 bytes of space, starting at the offset.
 			</description>
 		</method>
 		<method name="encode_u8">
@@ -253,6 +277,7 @@
 			<param index="0" name="byte_offset" type="int" />
 			<param index="1" name="value" type="int" />
 			<description>
+				Encodes a 8-bit unsigned integer number (byte) at the index of [param byte_offset] bytes. The array must have at least 1 byte of space, starting at the offset.
 			</description>
 		</method>
 		<method name="encode_var">
@@ -261,6 +286,7 @@
 			<param index="1" name="value" type="Variant" />
 			<param index="2" name="allow_objects" type="bool" default="false" />
 			<description>
+				Encodes a [Variant] at the index of [param byte_offset] bytes. A sufficient space must be allocated, depending on the encoded variant's size. If [param allow_objects] is [code]false[/code], [Object]-derived values are not permitted and will instead be serialized as ID-only.
 			</description>
 		</method>
 		<method name="fill">
@@ -314,6 +340,7 @@
 			<param index="0" name="byte_offset" type="int" />
 			<param index="1" name="allow_objects" type="bool" default="false" />
 			<description>
+				Returns [code]true[/code] if a valid [Variant] value can be decoded at the [param byte_offset]. Returns [code]false[/code] othewrise or when the value is [Object]-derived and [param allow_objects] is [code]false[/code].
 			</description>
 		</method>
 		<method name="hex_encode" qualifiers="const">
@@ -449,24 +476,29 @@
 			<return type="bool" />
 			<param index="0" name="right" type="PackedByteArray" />
 			<description>
+				Returns [code]true[/code] if contents of the arrays differ.
 			</description>
 		</operator>
 		<operator name="operator +">
 			<return type="PackedByteArray" />
 			<param index="0" name="right" type="PackedByteArray" />
 			<description>
+				Returns a new [PackedByteArray] with contents of [param right] added at the end of this array. For better performance, consider using [method append_array] instead.
 			</description>
 		</operator>
 		<operator name="operator ==">
 			<return type="bool" />
 			<param index="0" name="right" type="PackedByteArray" />
 			<description>
+				Returns [code]true[/code] if contents of both arrays are the same, i.e. they have all equal bytes at the corresponding indices.
 			</description>
 		</operator>
 		<operator name="operator []">
 			<return type="int" />
 			<param index="0" name="index" type="int" />
 			<description>
+				Returns the byte at index [param index]. Negative indices can be used to access the elements starting from the end. Using index out of array's bounds will result in an error.
+				Note that the byte is returned as a 64-bit [int].
 			</description>
 		</operator>
 	</operators>
diff --git a/doc/classes/PackedColorArray.xml b/doc/classes/PackedColorArray.xml
index c694927175..a2dc8e8f1d 100644
--- a/doc/classes/PackedColorArray.xml
+++ b/doc/classes/PackedColorArray.xml
@@ -177,6 +177,7 @@
 		<method name="to_byte_array" qualifiers="const">
 			<return type="PackedByteArray" />
 			<description>
+				Returns a [PackedByteArray] with each color encoded as bytes.
 			</description>
 		</method>
 	</methods>
@@ -185,24 +186,28 @@
 			<return type="bool" />
 			<param index="0" name="right" type="PackedColorArray" />
 			<description>
+				Returns [code]true[/code] if contents of the arrays differ.
 			</description>
 		</operator>
 		<operator name="operator +">
 			<return type="PackedColorArray" />
 			<param index="0" name="right" type="PackedColorArray" />
 			<description>
+				Returns a new [PackedColorArray] with contents of [param right] added at the end of this array. For better performance, consider using [method append_array] instead.
 			</description>
 		</operator>
 		<operator name="operator ==">
 			<return type="bool" />
 			<param index="0" name="right" type="PackedColorArray" />
 			<description>
+				Returns [code]true[/code] if contents of both arrays are the same, i.e. they have all equal [Color]s at the corresponding indices.
 			</description>
 		</operator>
 		<operator name="operator []">
 			<return type="Color" />
 			<param index="0" name="index" type="int" />
 			<description>
+				Returns the [Color] at index [param index]. Negative indices can be used to access the elements starting from the end. Using index out of array's bounds will result in an error.
 			</description>
 		</operator>
 	</operators>
diff --git a/doc/classes/PackedFloat32Array.xml b/doc/classes/PackedFloat32Array.xml
index 41d0679099..d350d64f38 100644
--- a/doc/classes/PackedFloat32Array.xml
+++ b/doc/classes/PackedFloat32Array.xml
@@ -4,7 +4,7 @@
 		A packed array of 32-bit floating-point values.
 	</brief_description>
 	<description>
-		An array specifically designed to hold 32-bit floating-point values. Packs data tightly, so it saves memory for large array sizes.
+		An array specifically designed to hold 32-bit floating-point values (float). Packs data tightly, so it saves memory for large array sizes.
 		If you need to pack 64-bit floats tightly, see [PackedFloat64Array].
 	</description>
 	<tutorials>
@@ -188,24 +188,29 @@
 			<return type="bool" />
 			<param index="0" name="right" type="PackedFloat32Array" />
 			<description>
+				Returns [code]true[/code] if contents of the arrays differ.
 			</description>
 		</operator>
 		<operator name="operator +">
 			<return type="PackedFloat32Array" />
 			<param index="0" name="right" type="PackedFloat32Array" />
 			<description>
+				Returns a new [PackedFloat32Array] with contents of [param right] added at the end of this array. For better performance, consider using [method append_array] instead.
 			</description>
 		</operator>
 		<operator name="operator ==">
 			<return type="bool" />
 			<param index="0" name="right" type="PackedFloat32Array" />
 			<description>
+				Returns [code]true[/code] if contents of both arrays are the same, i.e. they have all equal floats at the corresponding indices.
 			</description>
 		</operator>
 		<operator name="operator []">
 			<return type="float" />
 			<param index="0" name="index" type="int" />
 			<description>
+				Returns the [float] at index [param index]. Negative indices can be used to access the elements starting from the end. Using index out of array's bounds will result in an error.
+				Note that [float] type is 64-bit, unlike the values stored in the array.
 			</description>
 		</operator>
 	</operators>
diff --git a/doc/classes/PackedFloat64Array.xml b/doc/classes/PackedFloat64Array.xml
index bedbe3603c..690cb15fa7 100644
--- a/doc/classes/PackedFloat64Array.xml
+++ b/doc/classes/PackedFloat64Array.xml
@@ -4,7 +4,7 @@
 		A packed array of 64-bit floating-point values.
 	</brief_description>
 	<description>
-		An array specifically designed to hold 64-bit floating-point values. Packs data tightly, so it saves memory for large array sizes.
+		An array specifically designed to hold 64-bit floating-point values (double). Packs data tightly, so it saves memory for large array sizes.
 		If you only need to pack 32-bit floats tightly, see [PackedFloat32Array] for a more memory-friendly alternative.
 	</description>
 	<tutorials>
@@ -188,24 +188,28 @@
 			<return type="bool" />
 			<param index="0" name="right" type="PackedFloat64Array" />
 			<description>
+				Returns [code]true[/code] if contents of the arrays differ.
 			</description>
 		</operator>
 		<operator name="operator +">
 			<return type="PackedFloat64Array" />
 			<param index="0" name="right" type="PackedFloat64Array" />
 			<description>
+				Returns a new [PackedFloat64Array] with contents of [param right] added at the end of this array. For better performance, consider using [method append_array] instead.
 			</description>
 		</operator>
 		<operator name="operator ==">
 			<return type="bool" />
 			<param index="0" name="right" type="PackedFloat64Array" />
 			<description>
+				Returns [code]true[/code] if contents of both arrays are the same, i.e. they have all equal doubles at the corresponding indices.
 			</description>
 		</operator>
 		<operator name="operator []">
 			<return type="float" />
 			<param index="0" name="index" type="int" />
 			<description>
+				Returns the [float] at index [param index]. Negative indices can be used to access the elements starting from the end. Using index out of array's bounds will result in an error.
 			</description>
 		</operator>
 	</operators>
diff --git a/doc/classes/PackedInt32Array.xml b/doc/classes/PackedInt32Array.xml
index db4c8c0937..2f9032e214 100644
--- a/doc/classes/PackedInt32Array.xml
+++ b/doc/classes/PackedInt32Array.xml
@@ -188,24 +188,29 @@
 			<return type="bool" />
 			<param index="0" name="right" type="PackedInt32Array" />
 			<description>
+				Returns [code]true[/code] if contents of the arrays differ.
 			</description>
 		</operator>
 		<operator name="operator +">
 			<return type="PackedInt32Array" />
 			<param index="0" name="right" type="PackedInt32Array" />
 			<description>
+				Returns a new [PackedInt32Array] with contents of [param right] added at the end of this array. For better performance, consider using [method append_array] instead.
 			</description>
 		</operator>
 		<operator name="operator ==">
 			<return type="bool" />
 			<param index="0" name="right" type="PackedInt32Array" />
 			<description>
+				Returns [code]true[/code] if contents of both arrays are the same, i.e. they have all equal ints at the corresponding indices.
 			</description>
 		</operator>
 		<operator name="operator []">
 			<return type="int" />
 			<param index="0" name="index" type="int" />
 			<description>
+				Returns the [int] at index [param index]. Negative indices can be used to access the elements starting from the end. Using index out of array's bounds will result in an error.
+				Note that [int] type is 64-bit, unlike the values stored in the array.
 			</description>
 		</operator>
 	</operators>
diff --git a/doc/classes/PackedInt64Array.xml b/doc/classes/PackedInt64Array.xml
index 56d72692a2..5f762cde3e 100644
--- a/doc/classes/PackedInt64Array.xml
+++ b/doc/classes/PackedInt64Array.xml
@@ -188,24 +188,28 @@
 			<return type="bool" />
 			<param index="0" name="right" type="PackedInt64Array" />
 			<description>
+				Returns [code]true[/code] if contents of the arrays differ.
 			</description>
 		</operator>
 		<operator name="operator +">
 			<return type="PackedInt64Array" />
 			<param index="0" name="right" type="PackedInt64Array" />
 			<description>
+				Returns a new [PackedInt64Array] with contents of [param right] added at the end of this array. For better performance, consider using [method append_array] instead.
 			</description>
 		</operator>
 		<operator name="operator ==">
 			<return type="bool" />
 			<param index="0" name="right" type="PackedInt64Array" />
 			<description>
+				Returns [code]true[/code] if contents of both arrays are the same, i.e. they have all equal ints at the corresponding indices.
 			</description>
 		</operator>
 		<operator name="operator []">
 			<return type="int" />
 			<param index="0" name="index" type="int" />
 			<description>
+				Returns the [int] at index [param index]. Negative indices can be used to access the elements starting from the end. Using index out of array's bounds will result in an error.
 			</description>
 		</operator>
 	</operators>
diff --git a/doc/classes/PackedStringArray.xml b/doc/classes/PackedStringArray.xml
index b58a3b2553..2c3376d659 100644
--- a/doc/classes/PackedStringArray.xml
+++ b/doc/classes/PackedStringArray.xml
@@ -184,6 +184,7 @@
 		<method name="to_byte_array" qualifiers="const">
 			<return type="PackedByteArray" />
 			<description>
+				Returns a [PackedByteArray] with each string encoded as bytes.
 			</description>
 		</method>
 	</methods>
@@ -192,24 +193,28 @@
 			<return type="bool" />
 			<param index="0" name="right" type="PackedStringArray" />
 			<description>
+				Returns [code]true[/code] if contents of the arrays differ.
 			</description>
 		</operator>
 		<operator name="operator +">
 			<return type="PackedStringArray" />
 			<param index="0" name="right" type="PackedStringArray" />
 			<description>
+				Returns a new [PackedStringArray] with contents of [param right] added at the end of this array. For better performance, consider using [method append_array] instead.
 			</description>
 		</operator>
 		<operator name="operator ==">
 			<return type="bool" />
 			<param index="0" name="right" type="PackedStringArray" />
 			<description>
+				Returns [code]true[/code] if contents of both arrays are the same, i.e. they have all equal [String]s at the corresponding indices.
 			</description>
 		</operator>
 		<operator name="operator []">
 			<return type="String" />
 			<param index="0" name="index" type="int" />
 			<description>
+				Returns the [String] at index [param index]. Negative indices can be used to access the elements starting from the end. Using index out of array's bounds will result in an error.
 			</description>
 		</operator>
 	</operators>
diff --git a/doc/classes/PackedVector2Array.xml b/doc/classes/PackedVector2Array.xml
index 7cf63d3d5e..25650ef40a 100644
--- a/doc/classes/PackedVector2Array.xml
+++ b/doc/classes/PackedVector2Array.xml
@@ -178,6 +178,7 @@
 		<method name="to_byte_array" qualifiers="const">
 			<return type="PackedByteArray" />
 			<description>
+				Returns a [PackedByteArray] with each vector encoded as bytes.
 			</description>
 		</method>
 	</methods>
@@ -186,30 +187,35 @@
 			<return type="bool" />
 			<param index="0" name="right" type="PackedVector2Array" />
 			<description>
+				Returns [code]true[/code] if contents of the arrays differ.
 			</description>
 		</operator>
 		<operator name="operator *">
 			<return type="PackedVector2Array" />
 			<param index="0" name="right" type="Transform2D" />
 			<description>
+				Transforms (multiplies) all vectors in the array by the [Transform2D] matrix.
 			</description>
 		</operator>
 		<operator name="operator +">
 			<return type="PackedVector2Array" />
 			<param index="0" name="right" type="PackedVector2Array" />
 			<description>
+				Returns a new [PackedVector2Array] with contents of [param right] added at the end of this array. For better performance, consider using [method append_array] instead.
 			</description>
 		</operator>
 		<operator name="operator ==">
 			<return type="bool" />
 			<param index="0" name="right" type="PackedVector2Array" />
 			<description>
+				Returns [code]true[/code] if contents of both arrays are the same, i.e. they have all equal [Vector2]s at the corresponding indices.
 			</description>
 		</operator>
 		<operator name="operator []">
 			<return type="Vector2" />
 			<param index="0" name="index" type="int" />
 			<description>
+				Returns the [Vector2] at index [param index]. Negative indices can be used to access the elements starting from the end. Using index out of array's bounds will result in an error.
 			</description>
 		</operator>
 	</operators>
diff --git a/doc/classes/PackedVector3Array.xml b/doc/classes/PackedVector3Array.xml
index 5ab42474f0..22979a5a37 100644
--- a/doc/classes/PackedVector3Array.xml
+++ b/doc/classes/PackedVector3Array.xml
@@ -177,6 +177,7 @@
 		<method name="to_byte_array" qualifiers="const">
 			<return type="PackedByteArray" />
 			<description>
+				Returns a [PackedByteArray] with each vector encoded as bytes.
 			</description>
 		</method>
 	</methods>
@@ -185,30 +186,35 @@
 			<return type="bool" />
 			<param index="0" name="right" type="PackedVector3Array" />
 			<description>
+				Returns [code]true[/code] if contents of the arrays differ.
 			</description>
 		</operator>
 		<operator name="operator *">
 			<return type="PackedVector3Array" />
 			<param index="0" name="right" type="Transform3D" />
 			<description>
+				Transforms (multiplies) all vectors in the array by the [Transform3D] matrix.
 			</description>
 		</operator>
 		<operator name="operator +">
 			<return type="PackedVector3Array" />
 			<param index="0" name="right" type="PackedVector3Array" />
 			<description>
+				Returns a new [PackedVector3Array] with contents of [param right] added at the end of this array. For better performance, consider using [method append_array] instead.
 			</description>
 		</operator>
 		<operator name="operator ==">
 			<return type="bool" />
 			<param index="0" name="right" type="PackedVector3Array" />
 			<description>
+				Returns [code]true[/code] if contents of both arrays are the same, i.e. they have all equal [Vector3]s at the corresponding indices.
 			</description>
 		</operator>
 		<operator name="operator []">
 			<return type="Vector3" />
 			<param index="0" name="index" type="int" />
 			<description>
+				Returns the [Vector3] at index [param index]. Negative indices can be used to access the elements starting from the end. Using index out of array's bounds will result in an error.
 			</description>
 		</operator>
 	</operators>