fix: arity checking of call expression arguments - #386
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DeveloperC286
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Zipping the arguments with the parameters silently truncated to the shorter of the two. Calling with too few arguments left the unbound parameters resolving to Null, whilst extra arguments were discarded without ever being evaluated, so their side effects never ran. Compare the counts before binding and error with "Wrong number of arguments, want=2, got=1." instead. The check runs before the environment is pushed, so a rejected call leaves no scope behind. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WVqA23HZyr13UowhjHjNEt
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