BIP8: clarify timeoutheight behaviour and requirements #1019
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When lockinontimeout is true, we don't transition directly from STARTED to LOCKED_IN, so don't imply that we do. If startheight or timeoutheight are not on a retarget boundary, they behave as if they had been rounded up to the next retarget boundary, so to keep things simple, require them to be at a boundary. If timeoutheight is less than two retarget periods later than startheight, behaviour when lockinontimeout is true (one retarget period of STARTED, one of MUST_SIGNAL, one of LOCKED_IN, then ACTIVE) will not match behaviour when lockinontimeout is false (one retarget period of STARTED, then either LOCKED_IN or FAILED), so disallow that as well.
This was referenced Oct 19, 2020
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When lockinontimeout is true, we don't transition directly from STARTED
to LOCKED_IN, so don't imply that we do.
If startheight or timeoutheight are not on a retarget boundary, they
behave as if they had been rounded up to the next retarget boundary,
so to keep things simple, require them to be at a boundary.
If timeoutheight is less than two retarget periods later than startheight,
behaviour when lockinontimeout is true (one retarget period of STARTED,
one of MUST_SIGNAL, one of LOCKED_IN, then ACTIVE) will not match
behaviour when lockinontimeout is false (one retarget period of STARTED,
then either LOCKED_IN or FAILED), so disallow that as well.