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Additional cast methods for JsonValue #401

Description

@MikeEdgar

As of 1.1, the JsonValue interface provides convenience methods to cast the value to JsonObject and JsonArray. Is there a reason to limit things to those two cases?

Currently, the approach to get a value via a pointer looks like:

JsonObject obj = ...;
String target = ((JsonString) obj.getValue("/some/path/0/to/my/string")).getString();

It would be slightly nicer for the following:

JsonObject obj = ...;
String target = obj.getValue("/some/path/0/to/my/string").asJsonString().getString();

Similarly, methods for asJsonNumber and asJsonBoolean, perhaps with overloads that tolerate the ValueType of NULL with a default argument.

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