Handle when default args are provided.

[todo]

c-bootstrap/src/ast/FunSignature.cpp

Lines 28 to 33 in 6274271

	// TODO: Handle when default args are provided.
	if (funArgs.size() != rhs.funArgs.size())
	return false;
	// Check args match.
	for (unsigned int idx = 0u; idx < funArgs.size(); ++idx) {

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This issue was generated by todo based on a TODO comment in 6274271 when #99 was merged. cc @rdtscp.