References the name of a PARTUPGRADE require do unlock the subtype
At least one subtype on every switcher must have no tech restriction (i.e. unlocks with the part), otherwise it will complain and remove the restriction from the first subtype
All subtypes are unlocked in sandbox regardless of whether upgrades are applied
Warning if the upgrade doesn't exist
If you attempt to load a craft with a locked subtype you get a warning that it was replaced with the highest priority unlocked subtype
Add defaultSubtypePriority to SUBTYPEs
Number (float) that determines a subtype's priority as the "default" subtype (i.e. the one that is chosen when you freshly add the part).
The subtype with the highest priority that is also unlocked will be chosen
If two subtypes have the same priority and both are unlocked, it will choose the first
upgradeRequired
field toSUBTYPE
sPARTUPGRADE
require do unlock the subtypedefaultSubtypePriority
toSUBTYPE
s