Broken hairpinToBarline context property?

[Patrick McCarty]

Should the hairpinToBarline context property be set to true by
default?  In ly/engraver-init.ly, I see that it's set to true, but in
the default output, this property is set to false.  Compare this
snippet,

\relative c'' {
  e4\< e2. e1\!
  \set hairpinToBarline = ##f
  e4\< e2. e1\!
}

with this snippet:

\relative c'' {
  e4\< e2. e1\!
  \set hairpinToBarline = ##t
  e4\< e2. e1\!
}