[css-ui][css-flexbox] Should 'text-overflow' work on flexboxes?

http://dev.w3.org/csswg/css-ui/#text-overflow says:
  # This property specifies rendering when inline content overflows
  # its block container element ("the block") in its inline
  # progression direction that has ‘overflow’ other than ‘visible’.

http://dev.w3.org/csswg/css-flexbox/#flex-containers says:
  # Flex containers are not block containers,

Yet https://bugzilla.mozilla.org/show_bug.cgi?id=912434 was filed
with the expectation that text-overflow work on flexboxes, which
seems like a pretty reasonable expectation to me.

Should it?

-David

-- 
𝄞   L. David Baron                         http://dbaron.org/   𝄂
𝄢   Mozilla                          https://www.mozilla.org/   𝄂
             Before I built a wall I'd ask to know
             What I was walling in or walling out,
             And to whom I was like to give offense.
               - Robert Frost, Mending Wall (1914)