According to the W3 spec[1] the value should use a 1-based index
and not a 0-based index for the week number.

[1]: http://www.w3.org/TR/html-markup/datatypes.html#form.data.week

I spent a decent amount of time the other day trying to figure out why my active model including class wasn't generating the properly localized validation messages, and a note like this would have saved me a lot of time.

"checker" is the name being used everywhere.

This sucks, but otherwise I get occasional Fs on Mac OS X.

Mac OS X tries by all means to hide that /var is /private/var, and that is
what FSEvents reports back.

In particular files are no longer created in the current working directory,
but in a temporary folder.

This commit also bases everything on Pathname internally.

3.0.3 has a bug in OS X.