Common UNSAFE hints for `primR`

Available from bluerock.auto.cpp.hints.fractional.

This file provides hints that can be registered in order to read primitives which is very common.

The hints in this file are technically unsafe, but tend to work in practice due to the way that the weakest pre-condition rules work out.

You should enable one of the hints, but probably not both. Neither is enabled by default.

In cases were you do not need to split your fractions, you can enable.

  #[local] Hint Resolve UNSAFE_read_prim_cancel : br_opacity.

If you do need to split your fractions, you can enable.

  #[local] Hint Resolve UNSAFE_read_prim_frac_cancel : br_opacity.