uv

8c9bd70c - Avoid serializing if lockfile does not change (#4945)

Avoid serializing if lockfile does not change (#4945) ## Summary Avoid serializing and writing the lockfile if a cheap comparison shows that the contents have not changed. ## Test Plan Shaves ~10ms off of https://github.com/astral-sh/uv/issues/4860 for me. ``` ➜ transformers hyperfine "../../uv/target/profiling/uv lock" "../../uv/target/profiling/baseline lock" --warmup 3 Benchmark 1: ../../uv/target/profiling/uv lock Time (mean ± σ): 130.5 ms ± 2.5 ms [User: 130.3 ms, System: 85.0 ms] Range (min … max): 126.8 ms … 136.9 ms 23 runs Benchmark 2: ../../uv/target/profiling/baseline lock Time (mean ± σ): 140.5 ms ± 5.0 ms [User: 142.8 ms, System: 85.5 ms] Range (min … max): 133.2 ms … 153.3 ms 21 runs Summary ../../uv/target/profiling/uv lock ran 1.08 ± 0.04 times faster than ../../uv/target/profiling/baseline lock ```