[sf-perl] FreeBSD 12.2 lang/perl5-5.32.1_1 experimental 'isa' infix operator breaks UNIVERSAL::ISA

[Joseph Brenner]

Running bug.t with perl 5.32.1 on Debian 9.9,
I see tests 11, 12, 15, and 16 failing like so:

    Can't call method "isa" on unblessed reference

    Can't locate object method "isa" via package "MyArray::Class"

Using 5.28.2, all tests pass.