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I tried to use tclreadline-2.1.0 but it broke.

Platform:
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SunOS 5.7 Generic_106541-08 sun4u sparc SUNW,Ultra-2
gcc-3.0.4
readline-4.3 [with patches]
tcltk-8.4.0
tclreadline-2.1.0

Synopsis:
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$ tclshrl
% package require tclreadline
2.1.0
% ::tclreadline::Loop
tclsh8.4 [/tmp]
tclsh8.4 [/tmp] cd /tmp
alloc: invalid block: a64d8: 0 9 63
Abort (core dumped)
$
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I consistently get the above behavior.