[Petal] [PATCH] Options via constructor rather than package globals

[Jean-Michel Hiver]

> I think this pretty much guarantees that using these features with threads is 
> not safe. I'm not sure how many people will want to use Petal with threads 
> but...

I think it'll be fine. But I might be wrong :)

    http://perldoc.com/perl5.8.0/pod/perlthrtut.html#Thread-Safe-Modules

Cheers,
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