Post-review zerovec fixes

[Manishearth]

From #2599

[Manishearth]

ugh, we're hitting dropck eyepatch stuff

[sffc]

Looks good but please make it compile :)

[sffc]

Suggestion (optional): add a canary test?

I think this solution is just fine, though

[Manishearth]

Yeah, I'm not in a rush to remove this fix, I think we can leave it in without a test and if we notice it later we can fix it.

I've been monitoring the eyepatch thread, anyway

[sffc]

Nit: Shouldn't the compiler be able to figure this out on its own?

[Manishearth]

Usually, yes, but it doesn't hurt to help the compiler here.

[codecov-commenter]

Codecov Report

Merging #2622 (bb0788f) into main (ff1d4b3) will decrease coverage by 0.65%.
The diff coverage is 100.00%.

❗ Current head bb0788f differs from pull request most recent head 1d0a186. Consider uploading reports for the commit 1d0a186 to get more accurate results

@@            Coverage Diff             @@
##             main    #2622      +/-   ##
==========================================
- Coverage   73.97%   73.31%   -0.66%     
==========================================
  Files         420      427       +7     
  Lines       35052    36726    +1674     
==========================================
+ Hits        25929    26927     +998     
- Misses       9123     9799     +676     

Impacted Files	Coverage Δ
utils/zerovec/src/zerovec/mod.rs	85.71% <100.00%> (+1.62%)	⬆️
components/collections/src/codepointtrie/serde.rs	80.00% <0.00%> (-4.22%)	⬇️
...r/datagen/src/transform/cldr/datetime/skeletons.rs	90.90% <0.00%> (-2.85%)	⬇️
components/datetime/src/pattern/runtime/pattern.rs	94.73% <0.00%> (-2.57%)	⬇️
...er/datagen/src/transform/icuexport/collator/mod.rs	75.00% <0.00%> (-2.42%)	⬇️
...c/transform/icuexport/uprops/enum_codepointtrie.rs	79.54% <0.00%> (-1.85%)	⬇️
experimental/segmenter/src/dictionary.rs	95.83% <0.00%> (-1.61%)	⬇️
...nsform/cldr/locale_canonicalizer/likely_subtags.rs	91.52% <0.00%> (-1.58%)	⬇️
...er/datagen/src/transform/cldr/datetime/patterns.rs	23.25% <0.00%> (-1.14%)	⬇️
components/datetime/src/skeleton/helpers.rs	90.76% <0.00%> (-0.90%)	⬇️
... and 27 more

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