Hi, I filled an issue [1] to implement this idea. But I have a doubt about the case of inverted domain like this [('field', 'in', [value])], should it be considered as unique. Also it will be welcome to test all the views if you don't find weird behaviour.
[1] https://bugs.tryton.org/issue4552 Thanks, -- Cédric Krier - B2CK SPRL Email/Jabber: cedric.kr...@b2ck.com Tel: +32 472 54 46 59 Website: http://www.b2ck.com/