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hhvm
Clarify the purpose of `dynamic` more
Received feedback that "This special type is used to help capture dynamism in
the existing codebase in typed code, in a more manageable manner than mixed"
implied that dynamic was usually preferable to mixed; I don't think
this is the case as mixed is a real supertype-of-all.
David has some feedback about this - in particular, dynamic can be safer than ($mixed as foo)->bar() if you are not absolutely certain that mixed is a foo
whoops, did not mean to close it; still needs feedback addressing though
Perhaps worth mentioning soft types? That gives you all the checking of hard types, but without the runtime risks.
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