[fglock]

Summary

• Preserve hash-reference constant calls after typeglob undefinition, parse Error.pm's dynamic catch $class with { ... } form on both backends, and retain integer scalar identity through int() for decimal stringification.
• Keep a blessed scalar reference to a regex from changing the caller's regex referent, with a regression matching Test::Unit's assertion wrapper.
• Handle glob-backed hash dereferences used by Morpheus configuration traversal. Add focused overload-dispatch coverage using dynamically typed arguments and no cmp overload.
• Keep caller-filename normalization coverage in place.

Validation

• timeout 3600 nice -n 19 make on the master-based PR snapshot — passed after the runtime changes.
• make check-links — passed (806 links checked, 0 errors).
• Seven focused Perl unit files passed with system Perl (22 tests), the JVM backend, and the interpreter; the Java glob hash-dereference regression passed in make.
• Morpheus 0.46 t/file.t passed 27/27 on system Perl and both backends. The exact dynamically typed Morpheus::Key comparison also passed on all three runtimes.
• Test::Unit 0.30's t/all_tests.t, t/assert.t, and t/try_examples.t passed on system Perl and both PerlOnJava backends.
• Geo::Coordinates::OSGB 2.20 passed all 360 tests on system Perl and both backends.
• Unfixed-parent failure evidence was captured for the Morpheus::Key overloaded comparisons incorrectly require cmp #1342 glob traversal, Geo::Coordinates::OSGB 2.20 fails on constant hash-reference dereferences #1376 constant-reference, Test::Unit 0.30 fails on Error.pm catch syntax and example path normalization #1427 parser/path/regex-reference, and DateTime::Format::Epoch microsecond output uses scientific notation #1428 numeric-stringification regressions.

Fixes #1342
Fixes #1376
Fixes #1427
Fixes #1428