test(julia): cover macro signature guard branch #3939

Job	Run time
Lint	6m 17s
Security audit	6m 27s
TypeScript type check	6m 48s
Verify dynamic imports	8s
Native host build (macos-latest)	3m 3s
Native host build (ubuntu-latest)	3m 17s
Native host build (windows-latest)	5m 56s
Rust compile check	1m 3s
Pre-publish benchmark gate	11m 7s
Engine parity (macos-latest)	10m 57s
Test Node 22 (windows-latest)	15m 2s
Engine parity (ubuntu-latest)	6m 57s
Engine parity (windows-latest)	12m 6s
Test Node 22 (macos-latest)	11m 21s
Test Node 22 (ubuntu-latest)	9m 41s
CI Testing Pipeline	4s
	1h 50m 14s

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