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kotlinlang

I’m a bit confused with dictionaries in kotlin:
```
val map = mutableMapOf(...)
map[someKey] += 1  // error: operator += is not allowed on a nullable receiver :(
```
but my algrithm assumes that `someKey` is 100% presented in my map.
Ok, I’ll try `!!` operator (this is one I need in my situation, right?)
`map[someKey]!! += 1  // error: variable expected`

`map[someKey] = map[someKey]!! + 1`
It works, but seems a bit verbose. And I know, that verbosity isn’t a kotlin way.
Guys, need your help!