An interface for indexing access to a collection of key-value pairs, where type of key is String and type of value is Any?.
Calls to the function will be translated to indexing operation (square brackets) on the receiver with propertyName as the argument.
Calls of the function will be translated to an assignment of value to the receiver indexed (with square brackets/index operation) with propertyName.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.js/-json/index.html