Philipp Korber

no explicit self.sub assignment is done in the `__setstate__` method.

Some helpful context if someone wants to fix it: - the is currently no way in `sqlx` to specify a type like `FLOAT4[][]` - but to [quote the postgres doc](https://www.postgresql.org/docs/current/arrays.html#ARRAYS-DECLARATION):...

I added `Directive::builder()` which in combination with the already existing `EnvFilter::add_directive()` should resolve this issue. PR: https://github.com/tokio-rs/tracing/pull/3018