The KHR_animation_pointer specification is very clear:

If the Object Model Data Type is int, the output accessor component type MUST be one of the non-normalized integer types and its values are used as-is.

If the Object Model Data Type is bool, the output accessor component type MUST be unsigned byte; 0 is converted to false, any other value is converted to true.

Currently, Godot is always using single-precision floats when serializing Variant arrays, which means that Godot is generating invalid output when attempting to export an animation using ints or floats. This PR fixes this.