readline behaves differently in R than in bash

[paul]

I "set editing-mode vi" in ~/.inputrc.  In bash, it responds as
expected to (say) "dt,", which deletes characters upto the next comma.
It does not do this in R; instead, that series of keystrokes simply
causes the next two keystrokes to be consumed without any effect.  I
guess it would be wrong to assume that R uses the same readline
implementation as bash?  Is there anything I can set to get the
expected behaviour?

   64-bit Cygwin DLL version 1.7.28
   R version 3.0.1-1


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