Implement ArrayAccess->offsetExists
narrowing#3760
Draft
staabm wants to merge 1 commit intophpstan:2.1.xfrom
Draft
Implement `ArrayAccess->offsetExists` narrowing#3760staabm wants to merge 1 commit intophpstan:2.1.xfrom
staabm wants to merge 1 commit intophpstan:2.1.xfrom