Top Level Namespace

CLIENT SETINFO values must be printable ASCII with no spaces — the server rejects anything else, and redis-client swallows that error, which would silently leave lib-name empty. Parentheses are excluded as well: they delimit the suffix in lib-name=redis-rb(<suffix>), so a suffix containing them would corrupt the reported name.

Follows the official suffix convention, so that the transient pair redis-client itself builds from this value (lib-name=redis-client(redis-rb_v<version>)) is well-formed too.

Interpolated strings are not frozen by the magic comment; explicit freezes keep these constants Ractor-shareable (lazy module ivars here would raise Ractor::IsolationError).