Making crossmnt a default export option

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Hello,

What would be the ramifications of turning on the crossmnt
option on by default? Currently the the default is nocrossmnt.

In my recent work with pseudo exports, it has become very apparent
that having the crossmnt always set, especially with multi file
system exports, allows mount to "just work"!

So historically what is the reason for not allowing the clients
to always cross file systems? Is it a security issue? 
And again, what would be the ramifications always allowing, by
default, clients to cross file systems?

steved.
     
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