[Largo]

This PR covers two more #89 items after #115. Figures are Release builds on Linux, net8.0, compared against CRuby 4.0.

1. Direct keyword calls to methods with optional positionals (831c6df)

#115 let the method JIT compile def m(a, b = 2, k: 3). A keyword call to such a method still went through the specialized entry with its keyword Hash built. The direct keyword entry (JitKeywordCall) only accepted a call that passed exactly as many positionals as the method declares.

It now accepts any number from the mandatory count up. The call site fills in the literal defaults of the optionals the call leaves out, which is what the entry would have done.

For def f(a, b = nil, exception: true):

call	before	after
f(1, 2, exception: 1)	~119 ns	~11 ns
f(1, exception: 1)	—	~10 ns

2. Range#min, #max, #include? and #member? in C# (a22109a)

The prelude's def max(n = nil, &block) and def include?(value) were never compiled by the method JIT: the first has a block parameter, the second has a block in its body.

Now RangeOps answers these cases itself:

• min and max of an Integer range, with no block and no count;
• include? and member? of an Integer range asked about an Integer;
• include? and member? of a Float range asked about a number.

Everything else goes to the prelude as before, through __min__, __max__ and __include__. That covers Strings walked by #succ, blocks, counts, and endless or beginless ranges. These three methods are now private, and where they called super they now call Enumerable's min/max by name.

	master	this PR	CRuby
(1..100).max	200 ns	~5 ns	15 ns
(1..100).min	149 ns	20 ns	14 ns
(1..100).include?(50)	249 ns	16 ns	55 ns
(1.0..100.0).include?(50.5)	410 ns	58 ns	34 ns
(1..100).minmax	386 ns	135 ns	109 ns

Testing

• IronRuby.Tests passes with no failures. Two new tests take their expected output from CRuby:
  • Method_OptionalAndKeywordParameters2 covers direct calls after the methods are specialized.
  • Range_MinMaxInclude1 also covers blocks, a break from the block, counts, Strings, endless and beginless ranges, a subclass's own #max, and arity.
• ruby/spec with no failures:
  • language;
  • core/range, enumerable, enumerator, kernel, method, proc, struct, data, hash;
  • core/array/max_spec.rb and core/array/min_spec.rb;
  • library/stringio.

Still open from #89

• ('a'..'z').include?('m') is still ~1 µs, against ~185 ns in CRuby. The #succ walk runs in the prelude.
• Range#% and #step without a block are still ~2 µs. Most of that is building the Enumerator.
• Complex arithmetic and Integer#** have not been looked at yet.

---

Generated by Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Corrected range membership checks for numeric ranges, including mixed integer and floating-point values.
  • Improved min and max results for integer-ended ranges, including empty ranges.
  • Fixed calls to methods with optional positional and keyword arguments so omitted arguments use their declared defaults, including after repeated calls.
  • Improved range behavior across string, endless, beginless, and subclass ranges, including count and block arguments.

[coderabbitai]

Walkthrough

The changes extend direct JIT calls to keyword methods with omitted optional positional arguments. They also update range membership and extrema handling in C# and Ruby, with tests for both areas.

Changes: Keyword Call JIT

Layer / File(s)	Summary
Optional positional defaults in direct keyword calls Src/Ruby/Runtime/Jit/JitKeywordCall.cs, Src/Ruby/Runtime/Jit/JitStub.cs, Src/IronRuby.Tests/Runtime/MiscTests.cs, Src/IronRuby.Tests/RubyTests.cs	The JIT resolver records defaults for omitted optional positionals, and direct calls fill the omitted slots before invocation. Direct-entry eligibility now includes methods with optional positionals. Tests exercise repeated calls and register the test methods.

Range Operations

Layer / File(s)	Summary
Range helper methods and fallback paths Src/StdLib/ironruby/ruby4.rb	The range membership, maximum, and minimum helpers are renamed and made private. Custom-comparison paths call Enumerable#max and Enumerable#min directly.
Range membership and extrema dispatch Src/Libraries/Builtins/RangeOps.cs, Src/IronRuby.Tests/Runtime/MiscTests.cs	C# adds numeric membership checks and no-block extrema handling for integer-ended ranges. The tests cover membership, extrema, counted extrema, blocks, and other range cases.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Possibly related issues

• Largo/ironruby#89: The change adds C# membership handling for integer and mixed integer/double range cases, which addresses part of the issue’s stated range inclusion performance gap.

Possibly related PRs

• Largo/ironruby#115: This PR extends the same optional-positionals-before-keywords JIT path to direct keyword entries.
• Largo/ironruby#49: This PR extends the direct keyword-call path discussed in that PR to calls that omit optional positionals.
• Largo/ironruby#76: This PR extends the direct keyword-call path discussed in that PR to calls that omit optional positionals.

Suggested reviewers: claude, sholden

Merge Risk: Minimal · up to a2210

No actionable merge-blocking issue is established. The reported tests should receive the normal pre-merge run.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 41.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title identifies both main changes: JIT keyword calls with omitted optional arguments and C# handling of Range methods.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 41.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 12 functions across 6 files.

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

Finishing Touches

Generate docstrings

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Generate unit tests (beta)

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• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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Brakeman reported 52 analysis error(s); security analysis is incomplete

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Failed pre-merge checks:
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Write docstrings for the functions missing them to satisfy the coverage
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Commits

Reviewing files that changed from the base of the PR and between ece16d1 and a22109a.

Files ignored due to path filters: 1

• Src/Libraries/Initializers.Generated.cs is excluded by !**/*.generated.*

Files selected for processing: 6

• Src/IronRuby.Tests/RubyTests.cs
• Src/IronRuby.Tests/Runtime/MiscTests.cs
• Src/Libraries/Builtins/RangeOps.cs
• Src/Ruby/Runtime/Jit/JitKeywordCall.cs
• Src/Ruby/Runtime/Jit/JitStub.cs
• Src/StdLib/ironruby/ruby4.rb

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