Bugfix: Wallet: Migration: Adapt sanity checks for walletimplicitsegwit=0 #205
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Legacy wallets required segwit addresses to be explicitly defined (with walletimplicitsegwit=0, Knots default). This was originally so a third party couldn't take your non-segwit address and transform it into a segwit one to send you bitcoins. That was never a real-world issue.
To properly support that with descriptor wallets would require that we don't use
combo()in migration, which is probably more trouble than it's worth.Instead, just let legacy wallets gain implicit segwit support if migrated.