static boolean allowedInNamespace(final char character) {
    return KeyImpl.allowedInNamespace(character);
  }
Checks if {@code value} is a valid character in a namespace.

@param character the character to check
@return {@code true} if {@code value} is a valid character in a namespace, {@code false} otherwise
@since 4.12.0
key/src/main/java/net/kyori/adventure/key/Key.java