Walkthrough

The PR simplifies keyword argument handling in function calls by removing a per-call has_kwargs flag from the CallFunctionEx bytecode instruction. Instead, the system now relies on stack state: when kwargs are absent, a Null value is pushed onto the stack, enabling uniform CallFunctionEx invocation logic across compiler and VM execution layers.

Changes

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• Sort Instruction enum & related match arms #6322: Both PRs modify the Instruction::CallFunctionEx shape and its handling throughout the codebase, with this PR removing the per-call has_kwargs field entirely.
• Replace CallMethod/LoadMethod opcodes with plain Call #6674: Both PRs modify CallFunctionEx opcode and call-handling paths; the referenced PR introduced centralized CallFunctionEx with has_kwargs, while this PR removes the flag and converts to stack-driven kwargs via PushNull.
• Pseudo ops #6678: Both PRs touch the CallFunctionEx and kwargs codepath, modifying how keyword arguments are represented and handled across compiler and VM layers.

Suggested reviewers

• ShaharNaveh

Poem

🐰 No more flags upon the stack, just Nulls to light the way,
Where kwargs once were whispered true, now silence wins the day,
The CallFunctionEx hops along, so simple and so clean,
From flag-driven dreams to stack-based streams—the best refactor seen! ✨

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