# Adapt the `n_signature` to the contract
	# If `n_signature == null` return a new `ASignature` else it calls a specific adapt method see `adapt_specific_nsignature`
	private fun adapt_nsignature(n_signature: nullable ASignature): ASignature
	do
		if n_signature == null then return new ASignature
		return adapt_specific_nsignature(n_signature)
	end