I think it is very hard to read and for something that nobody does very often. (It'd make Perl like PHP, but with non-alphanumeric operators...) Introducing at least 8 new operators just to save a few characters is not worth it for such a rare occasion.

||= and //= are not comparing operators like > and <. They aren't comparison operators. They're normal binary operators that happen to short circuit. Syntactically they work like +, so they deserve a mutating variant, just like the other binary operators:

||    ||=
&&    &&=
^^    ^^=
//    //=
+     +=      ~     ~=
-     -=
*     *=
/     /=
%     %=
+&    +&=     ~&    ~&=
+|    +|=     ~|    ~|=
+^    +^=     ~^    ~^=
+<    +<=     ~<    ~<=
+>    +>=     ~>    ~>=
x     x=
[download]

I wouldn't be surprised to see . get a .=.

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