[perl #129878] [BUG][UNI] Stringifying a List adds in spaces between each item

[Sam S. via RT]

On Wed, 06 Sep 2017 15:20:17 -0700, coke wrote:
> With a recent rakudo, these now both output 1

Bisectable shows that it was fixed during recent MoarVM changes:

    https://gist.github.com/Whateverable/01a82d07e8009c7beffe5893432dddf2
    https://github.com/rakudo/rakudo/commit/593fa5f

Among the listed MoarVM commits, this one seems to be the most likely candidate 
based on its commit message:

    https://github.com/MoarVM/MoarVM/commit/62f66cbf

Marking this ticket TESTNEEDED.