[Melbourne-pm] Promoting old-school file handles to io::handles

[Ryan, Martin G]

Toby Corkindale says

> Some of the calling code was passing me filehandles that were, get this, 
> overloaded fileglobs that were blessed. Like this:

I have vague recollection that in early version of perl5 the *only* way you could pass filehandles into subs was via a typeglob reference.

Martin