Original:
{
  "Some String": "387"
}

After serialization to JSON and back:
{
  "Some String": 387
}

compound.getString("Some String"):
387

bytes:
0A000008000B536F6D6520537472696E67000333383700

bytes after serialization to JSON and back:
0A000002000B536F6D6520537472696E67018300