test(helper): observe post-expiry attribute visibility

cai

2026-08-12 bf538f10cc411d978bc30863085cd98c5ca18b14

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[source.crates-io]
replace-with = "rsproxy"
 
[source.rsproxy]
registry = "sparse+https://rsproxy.cn/index/"
 
[net]
retry = 5