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What prevents the SparkFun ESP32 Thing Plus DMX to LED Shield from being used with non-ESP32 Thing Pluses (ie SAMD51 or Artemis)?

I get the following error when compiling the Example 1 DMXOutput code with AMD51 and with Artemis Thing Pluses

error: no matching function for call to 'HardwareSerial::HardwareSerial(int)'
HardwareSerial DMXSerial(2);

Given the ESP32 capabilities the library for serial connections are build around HardwareSerial. So is 'Serial' defined as HardwareSerial(0), Serial1 as HardwareSerial(1). The RX/TX pins for serial connection can be assigned to nearly any pin.

I had look at the library to see whether it would be as easy as define DMXSerial as Serial2 but it requires more changes on a couple of places:
DMXSerial.begin(DMXSPEED, DMXFORMAT, rxPin, txPin)
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