I was almost led astray into the den of releasing a module with a name ending
in ::Tiny, but then I saved myself.
I found myself implementing these three methods, again:
sub read_handle { ... }
sub read_file { ... }
sub read_string { ... }
So, the second two translate the input into something the first can understand and business continues as normal. How often have I written this, or something like it? I'm not sure, but pretty often, anyway.
I wrote a very simple hunk of reusable code, stolen from Config-INI (which in turn stole from Config-Tiny), to let you get those two methods built for you. It uses Sub::Exporter, which means you can say what you want the methods to be called (mostly) and what method you want them to call when they've gotten a handle.
Of course, using Sub::Exporter also means pulling in a few more prerequisites, but that doesn't bother me. Once I'm writing non-trivial code, I'm very likely using Sub::Exporter anyway.
Mixin::Linewise is on the CPAN, and has both Reader and Writer modules.