I am getting an unexpected results with framedtexts.Why is the second "centered" not centered?

\starttext
\startframedtext[left][frame=on,offset=0pt,width=broad]
left\hfill
\stopframedtext
\startframedtext[middle][frame=on,offset=0pt,width=broad]
\hfil centered\hfil
\stopframedtext
\startframedtext[middle][frame=on,offset=0pt,width=broad]
\hfill centered\hfill
\stopframedtext
\startframedtext[right][frame=on,offset=0pt,width=broad]
\hfill right
\stopframedtext
\startframedtext[none][frame=on,offset=0pt,width=broad]
none
\stopframedtext
\stoptext

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ConTeXt  ver: 2016.04.01 13:01 MKIV beta  fmt: 2016.4.5  int: english/english

Hans van der Meer