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kotlinlang

Hello, I have such method in a library:
```open fun track(event: String, properties: Map&lt;Any?, *&gt;?, options: Map&lt;Any?, *&gt;?): Unit```
How can I create a map that would have satisfy `properties` type?

```fun track(event: String, properties: Map&lt;Any?, *&gt;?, options: Map&lt;Any?, *&gt;?): Unit {
    // implementation    
}

track("", mapOf("test" to 1, 1 to 2, null to null), mapOf("a" to ""))```
You can put every type you want in this :thinking_face:

But when I try this

```
val p = mutableMapOf&lt;String, Any&gt;()
track("", p, mapOf("a" to ""))```
it fails with

 Type mismatch: inferred type is MutableMap&lt;String, Any&gt; but Map&lt;Any?, *&gt;? was expected

Declare `p` type
```val p: Map&lt;Any?, String&gt; = mutableMapOf...```

Didn't quite help :disappointed:

```val p: Map&lt;String, Any?&gt; = mutableMapOf&lt;String, Any&gt;()
track("", p, mapOf("a" to ""))```

Type mismatch: inferred type is Map&lt;String, Any?&gt; but Map&lt;Any?, *&gt;? was expected

why are you parameterizing the call to `mutableMapOf()` with `String, Any` if you need `Any?, *`? keys in maps are invariant — just call `mutableMapOf&lt;Any?, Any&gt;()` and put your entries in