Catalina Authentication+HexUtils

[Christopher Cain]

Does anyone have any objections to my modifying the realm authentication 
classes so that hex digests are forced to uppercase for comparison? Case 
is irrelevant in a base-16 hex value, so the comparison should really be 
case-insensitive. I noticed this because authentication was inexplicably 
failing in one of my apps.

- Christopher

/**
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  */