# Description of Changes
The goal of this PR is to:
- Make it easy to switch our backing implementation of identifiers, as
seen in the commit changing to `LeanString`.
- Improve type safety of our identifiers by having every identifier
start with `RawIdentifier` and then `Identifier` is just a wrapper with
validation on construction. `TableName` and `ReducerName` are then just
wrappers around `Identifier`.
- Reduce allocation in `InstanceEnv` by using the now clone-on-write
O(1) + SSO optimized `Identifier`.
- Reduce allocations in the query engine as a consequence of improving
`RawIdentifier` and `Identifier`.
- Have `&'static str` strings be further optimized by avoiding to
allocate even for long ones. This is supported by `impl From<&'static
str> for RawIdentifier` as well as switching to `LeanString`.
The PR results in a roughly 2k TPS improvement over master for WASM +
hash indices. This should also help V8, as this is VM-agnostic.
# API and ABI breaking changes
None
# Expected complexity level and risk
3? Mostly just small changes in many places, but in a sea of small
changes, mistakes can happen.
# Testing
Covered by existing tests.
Noa