// in JBFundingCycleStore::_packAndStoreIntrinsicPropertiesOf
// where the `_start` is derived from `_mustStartAtOrAfter`

./JBFundingCycleStore.sol-518-    // start in bits 144-199.
./JBFundingCycleStore.sol:519:    packed |= _start << 144;
./JBFundingCycleStore.sol-520-
./JBFundingCycleStore.sol-521-    // number in bits 200-255.
./JBFundingCycleStore.sol-522-    packed |= _number << 200;
// example check for _mustSTartAtOrAfter
// in JBFundingCycleStore::configureFor

if (_mustStartAtOrAfter > type(uint56).max) revert INVALID_START();
