o_MapBinAtHashPutLevelCanDestroy

open override fun o_MapBinAtHashPutLevelCanDestroy(    self: AvailObject,     key: A_BasicObject,     keyHash: Int,     value: A_BasicObject,     myLevel: Int,     canDestroy: Boolean): A_MapBin

Add the given (key,value) pair to this bin, potentially modifying it if canDestroy is true and it's mutable. Answer the new bin. Note that the client is responsible for marking both the key and value as immutable if other references exists.