Long to number exception in protobuf maps

[Renat060888]

Hello!
I encountered a problem with uint64-keys in protobuf maps when I try to call toJSON() method - in case of quite big number it throws an exception: "Value is larger than Number.MAX_SAFE_INTEGER"

I noticed that regular uint64-fields are converted like this:
obj.objectId = (message.objectId || Long.UZERO).toString();

While maps try to do it like this:
message.floorNames.forEach((v, k) => { obj.floorNames[longToNumber(k)] = v; });

Why do the approaches differ here? Is this done on purpose?
I haven't found any flag to change the way the code is generated.
Thanks!