`gu` triggers the native vim function `to_lower()`, instead of LSP's `go_to_usages()`. We must unmap `gu` or map it to `<Nop>` before setting the LSP mapping.
gutriggers the native vim functionto_lower(), instead of LSP'sgo_to_usages(). We must unmapguor map it to<Nop>before setting the LSP mapping.