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kotlinlang

Is there any way to `mapKeys` and `mapValues` with a single pass? Here's what I have:

```
// transform a Map&lt;Int, Int&gt; into a Map&lt;String, String&gt;
val intMap = mapOf(1 to 2, 3 to 4)
val stringMap = intMap.mapKeys { it.key.toString() }.mapValues { it.value.toString() }
```

Here is one example of what I envision as a single pass (non-existent function `mapEntries`):

```
// transform a Map&lt;Int, Int&gt; into a Map&lt;String, String&gt;
val intMap = mapOf(1 to 2, 3 to 4)
val stringMap = intMap.mapEntries( { it.key.toString() }, { it.value.toString() )
```