E481: No range allowed

With native `<C-a>` & `<C-x>` keybindings we could do smth like that:
`25 => 10<C-a> => 35` & `25 => 10<C-x> => 15`.

But while using `Boole` with `<C-a>` & `<C-x>` remappings, this couldn't been reached due to the error.

As for now, I mapped `<leader>a` & `<leader>x` for this plugin and it works ok. But it will be really cool to totally replace native mappings.

Could it be fixed? Thanks