This was copied and pasted more than a handful of times around the
library and tests. Some implementations were more naive and did not
try to add quotes if there are spaces within a single argument.
There is one slight oddity in one of the cli parse tests. Stringifying
the command causes many of the arguments to show up in quotes when they
probably shouldn't. This seems to trace back to a deep problem related
to how commands are pulled out of package.scripts.start and is out of
scope for this patch. Even though the test might look incorrect now, it
is an accurate reflection of what the generated command is.
