fun <K, V> Map<out K, V>.toMutableMap(): MutableMap<K, V>
Platform and version requirements: Kotlin 1.1
Returns a new mutable map containing all key-value pairs from the original map.
The returned map preserves the entry iteration order of the original map.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/to-mutable-map.html