Context template: definefontfeature causes error

[David Nebauer <davidnebauer-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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When creating pdf output using context, pandoc fails with the error message:
tex error on line 15 in file /tmp/tex2pdf.2478/input.tex: ! Missing number, 
treated as zero

On creating context output line 15 turns out to be:
\definefontfeature[default][default][script=latn, protrusion=quality, expansion=quality, 
itlc=yes, textitalics=yes, onum=yes, pnum=yes]

On processing the context output directly I get the following expanded 
error message for line 15:

Dimensions can be in units of em, ex, in, pt, pc,
cm, mm, dd, cc, nd, nc, bp, or sp; but yours is a new one!
I'll assume that you meant to say pt, for printer's points.
To recover gracefully from this error, it's best to
delete the erroneous units; e.g., type `2' to delete
two letters. (See Chapter 27 of The TeXbook.)


tex error       > tex error on line 15 in file FILEPATH.tex: ! Illegal unit 
of measure (pt inserted)

In case it helps, here is the context output up to and including line 15:

% Enable hyperlinks
\setupinteraction
  [state=start,
  title={Minimal Working Example},
  style=,
  color=blue,
  contrastcolor=]
% make chapter, section bookmarks visible when opening document
\placebookmarks[chapter, section, subsection, subsubsection, 
subsubsubsection, subsubsubsubsection][chapter, section]
\setupinteractionscreen[option=bookmark]
\setuptagging[state=start]

\setuppapersize[a4]
% use microtypography
\definefontfeature[default][default][script=latn, protrusion=quality, 
expansion=quality, itlc=yes, textitalics=yes, onum=yes, pnum=yes]

Pandoc version is 1.17.2 on debian/testing.

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