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Upgrade::combineconsumes both inputs but clones the higher-precedence constraint map before merging it. Move the owned map instead, retaining the upgrade-strategy precedence and constraint ordering established by astral-sh#18226 and astral-sh#19955.Hyperfine 2.0.0 measurements of c4be69153 → 18379c72b used release builds of the complete CLI with
rustc 1.99.0 (b940084d7 2026-09-28)on an AMD EPYC-Genoa Linux VM, pinned to four CPUs. Output went to/dev/null. The supplied interpreter was CPython 3.12.13.uv pip compilereads--config-file,--upgrade-packageand local--find-linkswheels, with the selected--resolutionmode. Completeuv pip compilecommands combine synthetic command-line upgrade constraints with constraints in an explicituv.toml, then resolve local wheels. Cases vary 0 to 2,048 keys per source, one or 128 resolved packages, and highest or lowest resolution. Most paired maps use matching keys; the mostly disjoint case shares one key and has 2,047 unique keys on each side. Two controls leave one map empty.Local wheels provide versions 1.0.0, 2.0.0 and 3.0.0; matching
>=2and<3constraints select 2.0.0. The complete commands include parsing, settings combination, resolution and formatting, so they do not isolate the map merge. Per-revisionuvcaches persist and local wheel metadata and OS pages are warm. The commands use local wheels without network access, source builds or installation.Values are means, parent → head. Changes are
(head / parent - 1)with 95% confidence intervals; negative values indicate a reduction.Each workload used ten comparison blocks with alternating revision order, one warmup followed by three measured runs per revision in each block (30 measurements per revision). The pointwise 95% percentile-bootstrap intervals use 20,000 resamples of paired block means and retain all samples. They estimate within-run uncertainty, not variation across machines, independent builds, or separate benchmark campaigns.
Three cases were slower: 512 matching keys and one package (+1.04%), the mostly disjoint 2,048-key maps (+4.49%), and the 128-package highest-resolution case (+4.02%). The other seven runtime intervals include zero. Peak RSS rose by 3.36 MiB and 0.99 MiB in the latter two cases and fell in four others by 0.13–1.60 MiB; the remaining four intervals include zero. These complete-command results do not isolate the map merge. RSS is Hyperfine's Linux
wait4peak, not an allocation count or summed simultaneous process-tree memory.