replaceAll treats key as regex

[mpartel]

replaceAll should not treat its second parameter as a regex.

    "1$a2".replace('$a', 'b');  // => "1b2" as expected

but

    s("1$a2").replaceAll('$a', 'b').value();  // => "1$a2" but should be "1b2"

See also a stackoverflow discussion which suggests using the regex escape function presented here.

It might be nice to add the regex escape function to this library too.