xkv

xkv is used at run time in 6 crates (of which 2 optionally).

Depender (with downloads and own rev deps)			xkv version
500	2	captcha_verify		^0.1.44
850	1	ctx_	optional	^0.1.44
600		req_	optional	^0.1.44
		captcha_		^0.1.41
		xr		^0.1.37
		x0		^0.1.8