Bool creates a Conv object for converting booleans.

The optional flag suppresses the error message in case the key doesn't exist or results in an error.

Float creates a Conv object for converting floats.

Ifc creates a schema.Conv object for converting the given data to interface.

Int creates a Conv object for converting integers.

Str creates a schema.Conv object for converting strings.

StrFromNum creates a schema.Conv object that transforms numbers to strings.

Time creates a Conv object for converting Time objects.

SchemaOption is for adding optional parameters to the conversion functions.