Lastly.. I don't think those single quotes should be there. I'm not sure why they are there, and I would try removing them.

A hash key is a string, so it can be quoted. It's actually an exception to strict's strictness that you can do without quotes (only if it's a valid unquoted string, of course (/^\w+\z/). Same goes for =>'s left operand. Without strict, you can use unquoted strings everywhere (but don't drop strict, and don't use unquoted strings when not a hash key, or =>'s left operand).

/me prefers literal hash keys quoteless.

U28geW91IGNhbiBhbGwgcm90MTMgY
W5kIHBhY2soKS4gQnV0IGRvIHlvdS
ByZWNvZ25pc2UgQmFzZTY0IHdoZW4
geW91IHNlZSBpdD8gIC0tIEp1ZXJk