| The [Google Java Style Guide ยง5.2.4][style] requires constant names to use | |
| `CONSTANT_CASE`. | |
| [style]: https://google.github.io/styleguide/javaguide.html#s5.2.4-constant-names | |
| When naming a field with `CONSTANT_CASE`, make sure the field is `static`, | |
| `final`, and of immutable type. If the field doesn't meet those criteria, use | |
| `lowerCamelCase` instead. | |
| The check recognizes all primitive, `String`, and `enum` fields as deeply | |
| immutable. It is possible to create mutable enums, but doing so is | |
| strongly discouraged. |