StatsBase crosscor standard deviation does not have lags applied

Specific Domains Statistics
1

In StatsBase.crosscor!() why is the standard deviation for normalisation calculated before the lag is applied to the input vectors, rather than after?
This doesn’t appear to follow a standard correlation formula.

Cross-Correlation with StatsBase crosscor answer does not make sense

2

This is a common source of confusion, see issues

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