Reference Implementation version 1.3 for TIP#217
This is a 109-line context diff, involving adding 20
lines of code to tclCmdIL.c, no additional memory
overhead and only one additional integer comparison if
the new lsort -indices option is not invoked.
This supercedes both previous versions.
Also available at:
http://www.bovik.org/lsort-indices-diff.txt
Ref. Implementation v1.3 for TIP#217
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