Function
Common
```kotlin
fun InputTransformation.byValue(
transformation: (current: CharSequence, proposed: CharSequence) -> CharSequence
): InputTransformation
```
Creates an `InputTransformation` from a function that accepts both the current and proposed
`TextFieldCharSequence` and returns the `TextFieldCharSequence` to use for the field.
`transformation` can return either `current`, `proposed`, or a completely different value.
The selection or cursor will be updated automatically. For more control of selection implement
`InputTransformation` directly.