Create SIP for transferrable assets about sips

[MarvinJanssen]

Here is another example where things are made more difficult by the incompatibility of SIP009 and SIP010.

https://github.com/MarvinJanssen/stx-atomic-swap/blob/master/stx/contracts/sip009-sip010-htlc.clar

Edit:

And a transferable-trait for reference.

(define-trait transferable-trait
	(
		(transfer (uint principal principal) (response bool uint))
	)
)

[friedger]

Native nfts and fts are incompatible by nature because the further are transferred by identifier, the latter by amount. However, for NFTs that use a uint as identifier, the same method signature for transfer can be used as FTs.

[MarvinJanssen]

Sure, but in the case of SIP009 and SIP010 the above used to work which is pretty powerful. It is not out of the ordinary to represent either an amount or a token ID in a single uint.

[friedger]

Closing this in favor of #52