New features:

• All enum types are now supported (docs)
• Record decoder now supports both record(values) and record(keys, values) forms (docs)
• Add datelike decoder (docs)
• Add support for bigint (docs)
• Add built-in support for common string validations
• Better support for symbols in constant() and oneOf()

New decoders:

• enum_ (see docs)
• record() (see docs)
• select() (see docs)
• bigint (see docs)
• datelike (see docs)
• decimal (see docs)
• hexadecimal (see docs)
• numeric (see docs)

Renamed decoders:

Some decoders have been renamed because their names were based on Flowisms. Names have been updated to better reflect TypeScript terminology:

• dict() → record()
• maybe() → nullish()
• set() → setFromArray() (to make room for a better set() decoder in a future
  version)

Deprecated decoders:

The following decoders are deprecated because they were not commonly used, and a bit too specific to be in the standard library. They are also scheduled for removal in a future decoders version.

• dict() (prefer record())
• hardcoded() (prefer always())
• maybe() (prefer nullish())
• mixed (prefer unknown)
• numericBoolean()

Other changes:

• Fix: positiveNumber and positiveInteger no longer accept -0 as valid inputs
• Fix: either return type would sometimes get inferred incorrectly if members partially overlapped (see #941)
• Reorganized internal module structure
• Simplified some of the more complicated internal types