[PATCH 1 of 2] dicthelpers.diff: compare against default for missing values

[Bryan O'Sullivan]

On Wed, Apr 10, 2013 at 11:21 AM, Siddharth Agarwal <sid0 at fb.com> wrote:

> dicthelpers.diff: compare against default for missing values
>
> This is not only a bit faster, but also aligns with caller's expectations
> better since we can legitimately have manifestdict's _flags set to ''
> instead
> of unset.
>

This is all well and good, but it's now looking like a special-purpose
function that does exactly what manifestmerge needs, rather than a function
that belongs in a notionally general purpose module?
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