fix non-boolean modifications to boolean MF fields
fix non-boolean modifications to boolean MF fields

jcoady9/beets,ruippeixotog/beets,pkess/beets,mosesfistos1/beetbox,ttsda/beets,jbaiter/beets,YetAnotherNerd/beets,Andypsamp/CODjunit,lightwang1/beets,jayme-github/beets,ttsda/beets,Freso/beets,dfc/beets,mried/beets,asteven/beets,gabrielaraujof/beets,Andypsamp/CODfinalJUNIT,Andypsamp/CODfinalJUNIT,swt30/beets,lightwang1/beets,diego-plan9/beets,jackwilsdon/beets,parapente/beets,drm00/beets,arabenjamin/beets,gabrielaraujof/beets,pdf/beets,asteven/beets,gabrielaraujof/beets,shanemikel/beets,ibmibmibm/beets,arabenjamin/beets,Wen777/beets,shamangeorge/beets,beetbox/beets,artemutin/beets,bj-yinyan/beets,multikatt/beets,swt30/beets,moodboom/beets,artemutin/beets,marcuskrahl/beets,jayme-github/beets,jbaiter/beets,lengtche/beets,swt30/beets,pkess/beets,kareemallen/beets,marcuskrahl/beets,Andypsamp/CODfinalJUNIT,mosesfistos1/beetbox,imsparsh/beets,jmwatte/beets,diego-plan9/beets,kareemallen/beets,lengtche/beets,Kraymer/beets,kelvinhammond/beets,kelvinhammond/beets,Kraymer/beets,m-urban/beets,mathstuf/beets,moodboom/beets,Dishwishy/beets,Andypsamp/CODjunit,parapente/beets,swt30/beets,jcoady9/beets,ruippeixotog/beets,MyTunesFreeMusic/privacy-policy,tima/beets,SusannaMaria/beets,Wen777/beets,ttsda/beets,jmwatte/beets,xsteadfastx/beets,bj-yinyan/beets,imsparsh/beets,PierreRust/beets,randybias/beets,artemutin/beets,PierreRust/beets,moodboom/beets,Freso/beets,beetbox/beets,jmwatte/beets,kelvinhammond/beets,Dishwishy/beets,ibmibmibm/beets,mosesfistos1/beetbox,mathstuf/beets,randybias/beets,lengtche/beets,multikatt/beets,beetbox/beets,MyTunesFreeMusic/privacy-policy,kareemallen/beets,m-urban/beets,jackwilsdon/beets,jcoady9/beets,shamangeorge/beets,ttsda/beets,marcuskrahl/beets,drm00/beets,SusannaMaria/beets,krig/beets,LordSputnik/beets,dfc/beets,YetAnotherNerd/beets,ruippeixotog/beets,madmouser1/beets,Dishwishy/beets,parapente/beets,xsteadfastx/beets,ibmibmibm/beets,jcoady9/beets,xsteadfastx/beets,SusannaMaria/beets,jmwatte/beets,jackwilsdon/beets,m-urban/beets,tima/beets,sadatay/beets,asteven/beets,SusannaMaria/beets,Andypsamp/CODjunit,diego-plan9/beets,drm00/beets,imsparsh/beets,bj-yinyan/beets,shanemikel/beets,kelvinhammond/beets,drm00/beets,xsteadfastx/beets,LordSputnik/beets,krig/beets,Freso/beets,shanemikel/beets,mried/beets,untitaker/beets,mathstuf/beets,MyTunesFreeMusic/privacy-policy,LordSputnik/beets,randybias/beets,andremiller/beets,gabrielaraujof/beets,ruippeixotog/beets,tima/beets,sadatay/beets,LordSputnik/beets,madmouser1/beets,pkess/beets,sadatay/beets,mosesfistos1/beetbox,asteven/beets,Freso/beets,mathstuf/beets,beetbox/beets,mried/beets,YetAnotherNerd/beets,madmouser1/beets,shamangeorge/beets,Andypsamp/CODfinalJUNIT,Andypsamp/CODjunit,dfc/beets,mried/beets,arabenjamin/beets,lengtche/beets,Kraymer/beets,lightwang1/beets,krig/beets,diego-plan9/beets,untitaker/beets,PierreRust/beets,kareemallen/beets,sadatay/beets,randybias/beets,sampsyo/beets,m-urban/beets,andremiller/beets,arabenjamin/beets,MyTunesFreeMusic/privacy-policy,ibmibmibm/beets,shamangeorge/beets,sampsyo/beets,sampsyo/beets,tima/beets,Andypsamp/CODjunit,Wen777/beets,madmouser1/beets,YetAnotherNerd/beets,untitaker/beets,parapente/beets,moodboom/beets,untitaker/beets,lightwang1/beets,shanemikel/beets,multikatt/beets,PierreRust/beets,Andypsamp/CODfinalJUNIT,andremiller/beets,Dishwishy/beets,pkess/beets,bj-yinyan/beets,artemutin/beets,dfc/beets,marcuskrahl/beets,multikatt/beets,jackwilsdon/beets,sampsyo/beets,imsparsh/beets,pdf/beets,Kraymer/beets