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we have 4 venues in which we can add features, 3 of which are unilaterally controlled (`init`, `node_announcement`, and `invoices`) the `channel_announcement` is co-signed by both parties, so we can't add featurebits without additional coordination overhead. Each location is encoded as a key-value pair in a dict called `featurebits` in the manifest (omitted if no custom featurebits are set).