JuliaData / CategoricalArrays.jl / 190

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Add parentheses to correct operator precedence in `copy!` (#43)

`X | Y == Z` is being evaluated as `(X | Y) == Z` instead of the desired
`X | (Y == Z)` which causes `copy!`ing an ordered source array into an
ordered destination array with no existing levels to end up with the
destination unordered

This incidentally prevents in-line sorting of ordered categorical arrays
from working, e.g. `sort(x)` since this ultimately calls `copy!`,
causing `isless` to fail.

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