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A dictionary initialized with System.StringComparer.OrdinalIgnoreCase no longer finds values if culture has been changed from what it was at the time of inserting. This happens at least with "en-us" and "fi" cultures as in "fi" culture "w" and "v" are treated as same when sorting, most likely causing malfunction in GetHashCode or comparison. Dictionary works fine if culture is not changed. Tested on Raspberry Pi 2 + Arch Linux + Mono 126.96.36.199.
Following sample code prints out "ERROR" when run:
var test=new System.Collections.Generic.Dictionary<string, int>(System.StringComparer.OrdinalIgnoreCase);
Fixed in master