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How should a qr-code be formated with an amount in it?

The npm package ethereum-qr-code uses the following format according to EIP-67:

ethereum:0x7cB57B5A97eAbe94205C07890BE4c1aD31E486A8?gas=42000&value=10

But this format will not be recognized by every wallet on the market. Many wallets uses the "?amount=10" parameter from the bitcoin BIP21.

What format should be used, to cover most of the wallets?

In wich format is the value in EIP67 formatted? In Wei or Ether?

Is a hyprid version possible with value and amount parameter? e.g:

ethereum:0x7cB57B5A97eAbe94205C07890BE4c1aD31E486A8?gas=42000&value=10&amount=0.0001

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