I'm looking over PUP-2972, which is closely related to PUP-489, and is
specified (but changeable, hence this email!) at
https://github.com/puppetlabs/puppet-specifications/blob/master/language/expressions.md#-operator-8
and
https://github.com/puppetlabs/puppet-specifications/blob/master/language/expressions.md#-operator

PUP-2972 has information about what I found by looking at modules from the
forge and on github to see how += is being used right now. The purpose of
this is to try to make += consistent with +, the behavior of + to be much
more predictable, and -= is added by analogy with += existing.

What I'd like to know is:

  * Do the semantics specified make sense?
  * The recommendation of PUP-2972 suggests just dropping += (and -=)
because they are confusing. I'm reluctant to do that since it is already in
use and has been around for a while. Is it useful to keep them around?

The most notable change in functionality is that += won't work for string
concatenation anymore, because + doesn't do string concatenation. Instead
you'll need to use string interpolation ($a = "$a$b").

-- 
Andrew Parker
[email protected]
Freenode: zaphod42
Twitter: @aparker42
Software Developer

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