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When trying to generate tests for sqlboiler (a module that uses this module) I have encountered this error:
Unable to randomize ObjName object: unsupported type: models.NullEnumType

After debugging the issue, the problem seems to be that Null types generated by sqlboiler are not supported by this repo.
For example, enum.NullEnumType will not get randomized.

In randomize.go#L143 (link) we see:

	if kind == reflect.Struct {
		if shouldBeNull {
			value = getStructNullValue(s, fieldType, typ)
		} else {
			value = getStructRandValue(s, fieldType, typ)
		}
	} else {
...

Because the type is actually a struct (enum.NullEnumType) we get True and continue.
Based on shouldBeNull the relevant function is called.
Both functions support only type Date and doesn't "try" to resolve nullable structs (as it probably should, null types are supported by sqlboiler).

func getStructRandValue(s *Seed, fieldType string, typ reflect.Type) interface{} {
	if typ == typeTime {
		return Date(s.NextInt)
	}

	return nil
}

Adding a check for structs of type nullable will solve this issue.

Optional solution:
In the getStructRandValue/getStructNullValue add a simple check that verifies if the struct is of type nullable (using isValid or any other identifier).
If it is of this type, try to resolve the type of the value member of the struct.
In our case, it will be EnumType.
Then call the regular function getVariableRandValue/getVariableZeroValue for this member and get a valid random value.

That way, most of the newly created Nullable-EnumTypes will be supported.