[Groff] incorrect position of 'caron' glyph??

[Joerg van den Hoff]

hi everybody,

I noted the following. when defining


.ds Macasek "Mac\['a]\o'\[ah]s'ek
.ds macasek "Mac\['a]\[vs]ek
.DS
\*[Macasek]
\*[macasek]
.DE


one gets an optically pleasing 'scaron' (\[vs] (second line), but a 
seemingly slightly off-center (to the left) 'caron' (\[ah]) if you 
overstrike it with the letter 's' (first line).

at least if one generates pdf output and really zooms in ...

in short, my question is:

should

\o'\[ah]s'

yield exactly the same as

\[vs]

or is everything in perfect order anyway?

regards,

joerg