[gmpassos]

Problem

2.12.0's constructor invokers write each omittable argument inline as
identical(a[i], ConstructorReflection.absentArgument) ? default : a[i] as T.
dart_style is very slow on long argument lists of these: in a project with many large entity constructors, a clean build went from 6s (2.11.0) to 69s, 64s of it in formatting (its largest generated file alone: 41s), and its CI ensure_build test timed out at 120s.

Bisected to ef2fef1 (typed defaults in invokers).

Fix

• ConstructorReflection.argOrDefault<T>(arg, defaultValue): the default when arg is absentArgument, else arg as T.
• Generated invokers call it through __argOr$, a short alias declared in the generated file on first use (like the __RCD record aliases):

  invoker: (a) => Foo.named(a[0] as String, x: __argOr$<double>(a[1], 0)),

  The default is still typed in T's context (0.0 for double x = 0, a List<String> for const []).

Measured (that project's clean build, local)

	building	formatting
2.11.0	6s	<1s
2.12.0	69s	64s
inline ConstructorReflection.argOrDefault<T>	37s	32s
this PR (__argOr$)	7s	1.6s

That project with this builder: dart analyze clean, its entity/module tests pass.

Tests

• New argOrDefault unit test; build/generated-code tests updated to the new shape (the generated-code test still compiles the invokers under strict analysis and runs them).
• Regenerated test/example .g.dart.
• 562 pass locally. The two ReflectionInspector tests fail only when run from a git worktree under .claude/ (the inspector skips hidden dirs); they pass in the main checkout.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.54%. Comparing base (242e245) to head (17d9912).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #58   +/-   ##
=======================================
  Coverage   93.53%   93.54%           
=======================================
  Files          14       14           
  Lines        6532     6538    +6     
=======================================
+ Hits         6110     6116    +6     
  Misses        422      422           

Flag	Coverage Δ
unittests	93.54% <100.00%> (+<0.01%)	⬆️

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