Merge a list of Objects into O. Merges from left to right, first items get completed by the next ones (last-in completes).
O
to start with
to merge
(?='flat') 'deep' to do it deeply
'flat'
(?=BuiltIn) types not to merge
BuiltIn
(?=undefined) types of O to be replaced with ones of O1
undefined
O1
Object
Merge a list of Objects into
O. Merges from left to right, first items get completed by the next ones (last-in completes).