[vwnc] DefaultEncoder in Filename not threadsafe

> The DefaultEncoder shared variable in Filename is an
> EncodedStream. Being that it is mutable and not protected
> it is not threadsafe.
>
> As a general rule, mutable singletons are not threadsafe
> and should be either be eliminated(preferable) or protected.
>
> Terry
>  
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> Terry Raymond
> Crafted Smalltalk
> 80 Lazywood Ln.
> Tiverton, RI  02878
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