[Tcl-bugs] [ tcl-Bugs-2932421 ] Overeager String conversion in [format %s]

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Bugs item #2932421, was opened at 2010-01-15 00:01
Message generated for change (Tracker Item Submitted) made by ferrieux
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Category: 10. Objects
Group: current: 8.6b1
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Alexandre Ferrieux (ferrieux)
Assigned to: miguel sofer (msofer)
Summary: Overeager String conversion in [format %s] 

Initial Comment:
As described in

http://groups.google.com/group/comp.lang.tcl/tree/browse_frm/thread/1eb1932e16e25422/5cc54e913d84ec4b?rnum=1&_done=%2Fgroup%2Fcomp.lang.tcl%2Fbrowse_frm%2Fthread%2F1eb1932e16e25422%2Fb2ca7ba01ad9bef4%3F#doc_5cc54e913d84ec4b

[format %s] converts its object argument to tclStringType, due to generic handling of optional with specifiers.
 This is unnecessary, concatenation and char counting can very well be done at the string rep level (modified UTF-8), thus avoiding many cases of undue shimmering.

Note that [append] does the same, but the shimmering is unavoidable, since the result's internal repr is invalidated by appending.

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