Fix map concurrency bug in UnitsAnnotatedTypeFactory by removing stat…

[dimpal14]

Problem :
UnitsAnnotatedTypeFactory used un-synchronized static HashMaps (aliasMap and externalQualsMap). When multiple projects were compiled concurrently in the same JVM (e.g., using Gradle/Maven daemons), this shared global state caused ConcurrentModificationExceptions, compiler freezes, and cross-project memory leaks.

Fixed:
Removed the static modifier from both maps, converting them into instance variables. This correctly restricts the caches to the lifecycle of a single compilation run, ensuring thread-safety and preventing data bleeding between concurrent compilations.

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Reviewing files that changed from the base of the PR and between 753b38f and d583431.

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• docs/manual/contributors.tex

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📝 Walkthrough

Walkthrough

Changed the scope of externalQualsMap and aliasMap in the Units Checker from class-level static fields to per-instance final fields, so each UnitsAnnotatedTypeFactory maintains its own independent caches with initialization and lifetime tied to the factory instance. Also added a new contributor entry, "Dimpal Singh," to the project documentation.

🚥 Pre-merge checks | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

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[mernst]

Thanks for this fix.

When multiple projects were compiled concurrently in the same JVM (e.g., using Gradle/Maven daemons),

Can you provide a concrete test case (even if nondeterministic)? If not, is this a problem you have observed, or is it a potential (latent) problem that could occur in the future?