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Fixes a case where schema panicked when provided a pointer to embedded structs.

CHANGELOG

• fixed panic on pointers to embedded structs (#139) @morus12
• fixed decoding for "required" struct fields (#126) @kucherenkovova
• Create release-drafter.yml (#125) @elithrar
• Update config.yml (#123) @elithrar
• Create config.yml (#122) @elithrar

Decoding errors now have types for more comprehensive error reporting:

• UnknownKeyError is returned when an unknown key is encountered in the source map and the decoder is not set to ignore unknown keys.
• EmptyFieldError is returned when a required field is empty.

Both error types have a Key attribute that can be inspected to determine the field that caused the error.