chore(Order/Bounds/Basic): use to_dual more

[vihdzp]

---

Haven't dualized the whole file yet, but this is one more easy chunk out of the way.

[github-actions]

PR summary bf45c4f97e

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

---

Declarations diff (regex)

- bddAbove_Ioc
- bddBelow_Icc
- bddBelow_Ioc
- bddBelow_Ioo
- isGLB_Icc
- isGLB_Ico
- isLUB_Ico
- isLUB_Ioo
- isLeast_Icc
- isLeast_Ico
- lowerBounds_Icc
- lowerBounds_Ico
- upperBounds_Ico
- upperBounds_Ioo

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 bf45c4f).

• +0 new declarations
• −0 removed declarations

No declaration differences.

---

No changes to strong technical debt.

No changes to weak technical debt.

Current commit bf45c4f97e
Reference commit 80a3b5d919

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).