Unexpected foo==bar errors

[Mikael Magnusson <mikachu@gmail.com>]

% foo==bar
zsh: bar not found

This happens even with globassign and magicequalsubst turned off.

A comparison,

% foo='*bar'
% baz=$~foo
% echo $baz
*bar

% foo='=bar'
% baz=$~foo
zsh: bar not found

And how I happened upon this:
% tar tf =(foo) <tab>
_tar:70:  not found


I always thought of EQUALS expansion as a form of globbing; should it
be enabled in these contexts even though regular globbing isn't?
(
_tar:70 is
tf=${~words[3]}
)

-- 
Mikael Magnusson