I actually think languages should rather enforce spaces around (most) operators for a number of reasons. One is clarity, another one is that it should make the grammar simpler. Whether `alice+bob` is a good name for a variable is certainly up for debate but using hyphens for compound names (as in CSS) is in principle even better for readability than using underscores (and def better than cAmElCaSe). I find this a similar issue to the (to me, mal-) practice of allowing `.86` for what should properly be written `0.86`; this, too, introduces complexity with very little gain, if any, in usability.