* highlights(amber): highlight (null) as `@constant.builtin` * highlights(c): highlight (null) as `@constant.builtin` * highlights(opencl): mark (null) as `@constant.builtin` * highlights(prisma): highlight (null) as `@constant.builtin` and not `@constant.builtin.boolean` * highlights(v): highlight (nil) as `@constant.builtin` * queries(crystal): properly highlight (nil) and booleans * highlight(gdscript): highlight (null) as `@constant.builtin` * highlights(r): properly highlight null and nan * highlights(kotlin): don't highlight null as boolean