Minor, don't explode when mbstring is missing and don't do utf8-to-utf8 conversions.
Minor, don't explode when mbstring is missing and don't do utf8-to-utf8 conversions.

codelabs-ch/arcanist,zhihu/arcanist,phacility/arcanist,phacility/arcanist,uber/arcanist,aik099/arcanist,haskell-infra/arcanist,kevinseelbach/arcanist,uber/arcanist,hach-que/arcanist,codelabs-ch/arcanist,alexmv/arcanist,wharris/arcanist,dguo-coursera/arcanist,sneakpeeq/arcanist,phacility/arcanist,folsom-labs/arcanist,dguo-coursera/arcanist,wharris/arcanist,calblueprint/arcanist,Khan/arcanist,wharris/arcanist,kevinseelbach/arcanist,calblueprint/arcanist,codelabs-ch/arcanist,r4nt/arcanist,julkiewicz/arcanist,chundongwang/arcanist,KieranHayes/arcanist,sneakpeeq/arcanist,phacility/arcanist,alexmv/arcanist,uber/arcanist,wxstars/arcanist,Symplicity/arcanist,jra3/arcanist,memsql/arcanist,r4nt/arcanist,wikimedia/phabricator-arcanist,aik099/arcanist,julkiewicz/arcanist,zhihu/arcanist,r4nt/arcanist,PageUpPeopleOrg/arcanist-patches,PageUpPeopleOrg/arcanist-patches,codelabs-ch/arcanist,coursera/arcanist,jra3/arcanist,sneakpeeq/arcanist,alexmv/arcanist,dguo-coursera/arcanist,coursera/arcanist,wikimedia/phabricator-arcanist,phacility/arcanist,dguo-coursera/arcanist,hach-que/arcanist,eSpark/arcanist,KieranHayes/arcanist,sneakpeeq/arcanist,eSpark/arcanist,KieranHayes/arcanist,wxstars/arcanist,eSpark/arcanist,haskell-infra/arcanist,coursera/arcanist,eSpark/arcanist,coursera/arcanist,chundongwang/arcanist,memsql/arcanist,uber/arcanist,KieranHayes/arcanist,Khan/arcanist,wikimedia/phabricator-arcanist,chundongwang/arcanist,chundongwang/arcanist,zhihu/arcanist,wikimedia/phabricator-arcanist,PageUpPeopleOrg/arcanist-patches,memsql/arcanist,jra3/arcanist,julkiewicz/arcanist,Symplicity/arcanist,kevinseelbach/arcanist,folsom-labs/arcanist,Khan/arcanist,Khan/arcanist,fivestars/arcanist,PageUpPeopleOrg/arcanist-patches,folsom-labs/arcanist,memsql/arcanist,zhihu/arcanist,fivestars/arcanist,wharris/arcanist,hach-que/arcanist,fivestars/arcanist,folsom-labs/arcanist,julkiewicz/arcanist,haskell-infra/arcanist,hach-que/arcanist,wxstars/arcanist,haskell-infra/arcanist,aik099/arcanist,Symplicity/arcanist,kevinseelbach/arcanist,codelabs-ch/arcanist,jra3/arcanist,alexmv/arcanist,calblueprint/arcanist,calblueprint/arcanist,r4nt/arcanist,aik099/arcanist,wxstars/arcanist,Symplicity/arcanist,fivestars/arcanist