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Fixes: #4326
Summary
This change replaces the global unionRegistry and unionVariants maps with sync.Map and updates all read/write access sites to use the thread-safe Load and Store methods.
This prevents concurrent map write panics when RegisterUnion() is called from multiple goroutines.
Testing
Ran the existing test suite locally and all tests passed.
Changes being requested
Change from to a thread safe map version or usage mutex was requested.