types
GEnum ╰── FolksMaybeBool
A 'boolean' type that has a distinct 'unset' state.
FOLKS_MAYBE_BOOL_UNSET
This value is explicitly unset.
FOLKS_MAYBE_BOOL_FALSE
False (this value was set from its default of UNSET).
FOLKS_MAYBE_BOOL_TRUE
True (this value was set from its default of UNSET).
Since 0.3.1
