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This commit fixes a bug in DTUint16 and DTUint32, which would cause them to read too many bytes from the reader. This is due to the fact that ReadFull was being called on a slice that could be greater than the underlying type. This is not an issue for DTUint64, since the 8-byte buffer corresponds to the maximum possible size of a uint64. The solution is to clamp the buffer to 2 and 4 bytes respectively. A series of tests are also added to exercise these cases.