refactor: use cmpLE in LinearOrder

[astrainfinita]

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[github-actions]

PR summary 7a3c1f3e4d

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff (regex)

+ Std.LawfulLECmp.eq_cmpLE
+ cmpLE_eq_eq
+ cmpLE_eq_gt
+ cmpLE_eq_lt
+ compareOfLessAndEq_eq_cmpLE
+ compare_eq_compareOfLessAndEq
+ isGE_cmpLE
+ isLE_cmpLE

You can run this locally as follows

## from your `mathlib4` directory:
git clone https://github.com/leanprover-community/mathlib-ci.git ../mathlib-ci

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

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

The doc-module for scripts/pr_summary/declarations_diff.sh in the mathlib-ci repository contains some details about this script.

Declarations diff (Lean)

✅ Lean-aware diff — post-build, computed from the Lean environment (commit 7a3c1f3).

• +12 new declarations
• −4 removed declarations

+CompleteLinearOrder.compare_eq_cmpLE
-CompleteLinearOrder.compare_eq_compareOfLessAndEq
+ConditionallyCompleteLinearOrder.compare_eq_cmpLE
-ConditionallyCompleteLinearOrder.compare_eq_compareOfLessAndEq
+LinearOrder.compare_eq_cmpLE
-LinearOrder.compare_eq_compareOfLessAndEq
+Std.LawfulLECmp.eq_cmpLE
+cmpLE_eq_eq
+cmpLE_eq_gt
+cmpLE_eq_lt
+compareOfLessAndEq_eq_cmpLE
+compare_eq_compareOfLessAndEq
+isGE_cmpLE
+isLE_cmpLE
+tacticCmpLE_rfl
-tacticCompareOfLessAndEq_rfl

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No changes to strong technical debt.

No changes to weak technical debt.

Current commit 7a3c1f3e4d
Reference commit ac10dc7e9a

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).

[JovanGerb]

What is the motivation for preferring cmpLE? Is it computationally more efficient?

[astrainfinita]

I'm trying to remove the DecidableEq and DecidableLT fields from LinearOrder. I'll open a follow-up PR soon.