Use `class.name` instead of `class.to_s`

`class.name` is faster, uses less memory than `class.to_s`, and can
be used in this context.

This micro optimization does not have practical effect, it is just a
reference for the future in case this approach will be needed in
other parts of the library

```
Comparison (IPS):
         Object.name: 13528803.0 i/s
         Object.to_s:  8213612.0 i/s - 1.65x  (± 0.00) slower

Comparison (Memory):
         Object.name:          0 allocated
         Object.to_s:         40 allocated - Infx more
```

0 files changed, 0 insertions, 0 deletions