test(julia): cover macro signature guard branch #3954

Job	Run time
Security audit	6m 6s
TypeScript type check	6m 47s
Lint	6m 34s
Native host build (ubuntu-latest)	3m 34s
Native host build (windows-latest)	6m 22s
Native host build (macos-latest)	2m 34s
Rust compile check	1m 2s
Verify dynamic imports	7s
Test Node 22 (windows-latest)	14m 57s
Pre-publish benchmark gate	9m 28s
Test Node 22 (macos-latest)	13m 19s
Engine parity (windows-latest)	11m 30s
Engine parity (ubuntu-latest)	6m 42s
Engine parity (macos-latest)	10m 30s
Test Node 22 (ubuntu-latest)	9m 4s
CI Testing Pipeline	4s
	1h 48m 40s

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