[stringtemplate-interest] thread safety

[Nikolas Everett]

>
> BTW: the DateRenderer you announced recently implicitly relies on
> the fact that DateFormat.get...Instance(style) does _not_ return the same
> object for the same style. If it would (which we cannot control and
> which could change with any jdk update), calling f.format(d) would
> not be thread safe as DateFormat ist not thread safe.
>  synchronized(f) {return f.format(d);}
> would therefore be safer.
>
>
> While your point is valid that update would break a lot more than just ST.
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