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From: Antony Polukhin (antoshkka_at_[hidden])
Date: 2020-07-24 11:25:30

I'd like to merge the following fixes:

1) Missing include in LexicalCast
2) Missing includes in DLL
3) Variant issue that was preventing it from being used with Thread
(thanks to Andrzej Krzemieński for the diagnose and fix!)

Best regards,
Antony Polukhin

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