v1.21.0

• New decoder lazy(): lazily-evaluated decoder, suitable to define
  self-referential types.

• Fix compatibility with Flow 0.127.0

v1.20.2

• Fix compatibility with Flow 0.126.0+

v1.20.1

• Upgrade debrief to correct (final) version

v1.20.0

• Fix issue where infinite recursion occurs when input object (the object being validated) contains a circular reference

v1.20.0-rc1

Bump to 1.20.0-rc1

v1.19.1

• Republish due to an NPM outage

v1.19.0

New decoders:

• To complement the tuple family of decoders, there's now also tuple1 (thanks
  @sfarthin!)

v1.18.1

• Also fix Flow type bugs when Flow option exact_by_default=true in debrief dependency

v1.18.0

New decoders:

• nonEmptyString: like string, but will fail on inputs with only whitespace
  (or the empty string)

• nonEmptyArray: like array, but will fail on inputs with 0 elements

Fixes:

• Fix Flow type bugs when Flow option exact_by_default=true is enabled

v1.17.0

May cause breakage for Flow users:*

• Fix subtle bug in object() and exact() Flow type definitions that could
  cause Flow to leak any under rare circumstances.

(*: For TypeScript users, this version is identical to v1.16.1.)