Sequence[.tags.FieldType.EnumType.EnumValue]
Required on create; optional on update. The
set of allowed values for this enum. This set
must not be empty, the display names of the
values in this set must not be empty and the
display names of the values must be case-
insensitively unique within this set. Currently,
enum values can only be added to the list of
allowed values. Deletion and renaming of enum
values are not supported. Can have up to 500
allowed values.