Actually literally can still mean what it always did. It just has an additional, annoyingly contrary meaning as well.

Big deal. What about "cleave?" You can "cleave together" or "cleave people apart." Nobody seems to object, because so few use the word in ordinary speech or writing that there's no fun in feeling superior to them.

The same is true for both "perfect" and "unique." The original meanings still obtain, but they also mean "nearly unique" and "nearly perfect."

As in the other cases, and unless the speaker or writer is very sloppy, context will tell. Minimal context, however, can lead to the annoying or dangerous ambiguities people dread. (Think about labels that used to say nothing but "inflammable," which had to be changed to "flammable" because the unread might think it meant just the opposite.

Context is quite as important to understanding as are dictionary definitions. It's all that hat makes figures of speech comprehensible.

Dictionary definitions provide allow people to assert that newly familiar words and meanings are "just wrong." However, the first, brief, monolingual English dictionary didn't appear till 1604.

Chaucer and the youthful Shakespeare, for example, did all right without one by using whatever words that seemed fitting to them.

Context, context, context.