[io grant] Fix up IO::Handle.split
[io grant] Fix up IO::Handle.split

- It's no longer lazy-read due to a bug, which likely won't get
    fixed until we get a proper Cat

MasterDuke17/doc,antquinonez/doc,MasterDuke17/doc,perl6/doc,stmuk/doc,gfldex/doc,dmaestro/doc,stmuk/doc,tbrowder/doc,jonathanstowe/doc,gfldex/doc,tbrowder/doc,perl6/doc,jonathanstowe/doc,dmaestro/doc,jonathanstowe/doc,antquinonez/doc,perl6/doc,dmaestro/doc,antquinonez/doc,stmuk/doc,stmuk/doc,jonathanstowe/doc,MasterDuke17/doc,dmaestro/doc,jonathanstowe/doc,perl6/doc,tbrowder/doc,perl6/doc,tbrowder/doc,antquinonez/doc,gfldex/doc,gfldex/doc,gfldex/doc,MasterDuke17/doc,dmaestro/doc,antquinonez/doc,stmuk/doc