Поддержка многострочного значения поля формы (multipart/form-data) #241

Job	Run time
test (dev) / build (ubuntu-latest, dev)	2m 26s
test (stable) / build (ubuntu-latest, stable)	2m 12s
test (dev) / build (windows-latest, dev)	3m 22s
test (stable) / build (windows-latest, stable)	2m 5s
	10m 5s

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