User "Steve Litt" showed up on the chat, and offered 3 pastes
5306 to 5308

It turns out, that the  yaml::huddle2yaml  fails to convert
back a huddle string that was created from yaml::yaml2huddle

The huddle-string obtained from yaml was:
HUDDLE {!!map {fname {!!str Steve} lname {!!str Litt}}}
same for all checked versions(see below)

but on converting back to yaml, the newer versions just
prepended a line of three dashes to the huddle-string.

Versions:
tcllib1.17  yaml 0.3.7   huddle 0.1.5   worked
tcllib1.18  yaml 0.3.9   huddle 0.2     failed
tcllib1.19  yaml 0.4.1   huddle 0.3     failed

Unfortunately huddle changed a big lot between 0.1.5 and 0.2
so I gave up trying to spot the problem from a side-to-side diff
of the two huddle.tcl's.