Hints

A hint is an arbitrary piece of data that can be added to a schema, at the struct level, or at the field/member level.

You can think of it as an annotation that can communicate additional information to encoders/decoders (for instance, a change in a label, a regex pattern some string should abide by, a range, etc)

This Hints interface is a container for hints.

Under the hood, the hints are composed of two maps : one for member-level hints, one for target-level hints.