consider aliasing if-let to with?

[machty]

I don't feel super strongly about this but maybe it'd be nice for this library to also alias if-let to with? Rationale: with is an unfortunate name whose falsy inverse behavior is unexpected, whereas if-let speaks more to its semantics and putting it in this addon might be a nice way to collectively nudge folks away from with.

[Robdel12]

I mean, I like it.

[mmun]

I like it too.

[machty]

ok so let's add it. who knows how to alias stuff?

[rwjblue]

I would add an AST transform to rewrite with to if-let:

Links:

• http://jsbin.com/xurimeb/edit?html,js,output - Does the simplest thing that "works".
• https://github.com/thefrontside/ember-let/blob/master/lib/inline-let-transform.js - Example of one currently used for inline form
• https://github.com/thefrontside/ember-let/blob/master/index.js#L16-L22 - AST transform registration

[tchak]

with takes a single argument where I would expect if-let to take multiple...