fix: fix slice init length

[huochexizhan]

The intention here should be to initialize a slice with a capacity of len(repeatMap) rather than initializing the length of this slice.

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[lbajolet-hashicorp]

Thanks for this fix @huochexizhan, this LGTM, good catch!

Will run tests now and merge if green

[lbajolet-hashicorp]

Only test failing is Vercel, not a concern for this change, merging now.

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