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Commit 01b100ad authored by Guanqun Lu's avatar Guanqun Lu Committed by Gav Wood
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add mutate api (#695) 

* runtime-storage: add 'mutate' api

* support mutate for StorageValue

* try adding 'mutate' for map

* dispatch on Option<> type

* add check for prev_some

* consolidate the wrap type

* unify wrap type handling

* add sample for StorageValue
parent db02933d
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