[Dart] NULL-CHARACTER removal

[Brad King]

Jim,

> Which versions of Tcl are working and which are causing a problem?  
> The regexp engine changed quite a bit at Tcl 8.1?
When we first encountered the problem, it was on a cygwin version of Tcl,
so I assumed they had messed something up.  However, I just checked, and
it was actually Tcl 8.0.  I also just found a newsgroup message that said
the Tcl string handling mechanism in Tcl 8.0 and before couldn't handle
null-bytes, but 8.1 and after could.  I'm pretty convinced that this is
the problem.  I can put in a check for Tcl version that disables the
replacement, but do you know of a way to do it for older Tcl versions?

Thanks,
-Brad