Sourced from github.com/zclconf/go-cty's releases.

v1.16.0

• convert: When converting between two different capsule types, will now try to use the "conversion from" implementation from the target type if the source type doesn't have a suitable "conversion to" implementation. (#194)
• convert: When converting to a map whose element type is an object type with optional attributes, will no longer construct a broken result when a final map is empty. (#198)

Sourced from github.com/zclconf/go-cty's changelog.

1.16.3 (May 16, 2025)

• convert: Now generates more specific error messages in various cases of type conversion failure, giving additional information about the type that was given as compared to the type that was wanted by the caller.

1.16.2 (January 21, 2025)

• json: ImpliedType now returns an error if a JSON object contains two properties of the same name. As a compatibility concession it allows duplicates whose values have the same implied type, since it was unintentionally possible to combine ImpliedType and Unmarshal successfully in that case before, but this is not an endorsement of using duplicate property names since that makes the input ambiguous in any case. (#199)
• function/stdlib: ElementFunc no longer crashes when asked for a negative index into a tuple. This fixes a miss in the negative index support added back in v1.15.0. (#200)

1.16.1 (January 13, 2025)

• cty: Value.HasElement now treats unknown set elements consistently with how much of the rest of cty treats them.
• function/stdlib: FormatFunc and FormatListFunc now handle unknown and null values of unknown type as arguments, rather than letting the function system's short-circuit behavior take care of it. This allows cty.DynamicVal and cty.NullVal(cty.DynamicPseudoType) to be treated consistently with other values, returning results consistent with the documented behavior, rather than forcing the function to immediately return cty.DynamicVal.

1.16.0 (January 3, 2025)

• convert: When converting between two different capsule types, will now try to use the "conversion from" implementation from the target type if the source type doesn't have a suitable "conversion to" implementation. (#194)
• convert: When converting to a map whose element type is an object type with optional attributes, will no longer construct a broken result when a final map is empty. (#198)

1.15.1 (November 26, 2024)

• function: Function calls can now return more mark-related information when called with unknown values when neither AllowMarks nor AllowUnknown are set for a particular parameter. (#196)

1.15.0 (July 15, 2024)

• function/stdlib: The element function now accepts negative indices, extending the illusion of an infinitely-long list into the negative direction too.
• cty: The various "transform" functions were previously incorrectly propagating marks from a parent object down to attribute values when calling the caller-provided transform functions. The marks will now no longer be propagated downwards, which is consistent with the treatment of collection and tuple elements. If your transform function needs to take into account context about marks of upstream containers then you can maintain a stack of active marks in your Transformer implementation, pushing in Enter and popping in Exit. (#185)

1.14.4 (March 20, 2024)

• msgpack: Now uses string encoding instead of float encoding for a whole number that is too large to fit in any of MessagePack's integer types.
• function/stdlib: Type conversion functions (constructed with MakeToFunc) can now convert null values of unknown type into null values of the target type, rather than returning an unknown value in that case.
• json: Will now correctly reject attempts to encode cty.DynamicVal, whereas before it would just produce an invalid JSON document without any error. (This is invalid because JSON encoding cannot support unknown values at all; cty.DynamicVal is a special case of unknown value where even the type isn't known.)

1.14.3 (February 29, 2024)

• msgpack: Fixed edge-case bug that could cause loss of floating point precision when round-tripping due to incorrectly using a MessagePack integer to represent a large non-integral number. #176
• cty: Fixed some false-negative numeric equality test results by comparing numbers as integers when possible. #176

1.14.2 (January 23, 2024)

• convert: Converting from an unknown map value to an object type now correctly handles the situation where the map element type disagrees with an optional attribute of the target type, since when a map value is unknown we don't yet know which keys it has and thus cannot predict what subset of the elements will get converted as attributes in the resulting object. (#175)

• a49320f Prepare for v1.16.3 release
• 89f0621 convert: More forthcoming about cause in MismatchMessage
• 67d85b6 Prepare for a future v1.16.3 release
• 51a6901 v1.16.2 release
• 1c48de3 json: ImpliedType rejects duplicate property names of different types
• d13b46e function/stdlib: ElementFunc handles negative index into tuple
• 0ed0ebb Prepare for future v1.16.2 release
• b319524 v1.16.1 release
• e41d261 cty: Fix various Value.HasElement quirks, and add tests
• 8920baa function/stdlib: FormatFunc and FormatListFunc can handle DynamicPseudoType
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