Functions with default values causes "Overload resolution ambiguity"

A lot of functions have illegal overloads when default value parameter is used. e.g. `assert.assert` package:
```
external fun equal(actual: Any, expected: Any, message: String = definedExternally)
external fun equal(actual: Any, expected: Any, message: Error = definedExternally)
<...>
```
All functions with default values are unusable in this module.

Using any of them causes:
```
e: <...>: Overload resolution ambiguity:
public external fun equal(actual: Any, expected: Any, message: Error = ...): Unit defined in assert.assert
public external fun equal(actual: Any, expected: Any, message: String = ...): Unit defined in assert.assert
```

Start by locating the assert.assert external declarations shown in the issue and reproduce the overload resolution error with a default-valued function call. The work is done when those functions can be used without Kotlin reporting ambiguity between the Error and String overloads.

Written by the indexing model from the issue text.