The old style of merging all of a function's variable declarations into
a single statement made some sense back in the days of var, but there's
no reason to keep doing it now that we use const and let.
This will allow us to add support for custom object formatters, which
will be a per-runable resource like custom matchers, by injecting them
into the pretty-printer.
By deferring the evaluation of these messages, we can avoid the
expensive creation of them when in the majority use case (tests are
passing) they are not needed.
These failure messages were causing performance problems with larger
objects needed to be pretty printed as discussed in #520 and brought up
by @rdy.
[fixes#65925900][fixes#520]
- Will replace rake core_specs.
- Remove obsolete dependencies & files -- most of these were for build tasks we
are no longer using. Notably, rspec and spec_helper were deleted.
