perf(Polynomial/HasseDeriv): explicit type annotations for compHom

[mcdoll]

---

[mcdoll]

!radar

[leanprover-radar]

Benchmark results for 0c7bbc2 against 7e1d43c are in. No significant results found. @mcdoll

• ✅ build//instructions: -18.7G (-0.01%)

Small changes (3✅)

• ✅ build/module/Mathlib.Algebra.Ring.Action.Rat//instructions: -501.7M (-10.10%)
• ✅ build/module/Mathlib.Lean.ContextInfo//instructions: -126.3M (-3.86%) (reduced significance based on absolute threshold)
• ✅ build/module/Mathlib.Tactic.Change//instructions: -126.6M (-4.08%)

[github-actions]

PR summary 6382abce16

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

---

Declarations diff

No declarations were harmed in the making of this PR! 🐙

You can run this locally as follows

## summary with just the declaration names:
./scripts/pr_summary/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/pr_summary/declarations_diff.sh long <optional_commit>

The doc-module for scripts/pr_summary/declarations_diff.sh contains some details about this script.

---

No changes to technical debt.

This script lives in the mathlib-ci repository. To run it locally, from your mathlib4 directory:

git clone https://github.com/leanprover-community/mathlib-ci.git ../mathlib-ci
../mathlib-ci/scripts/reporting/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).