at(keySymbol)
Returns a Sequence for the value at the given key or nil if there is no such key.
atPut(keySymbol, valueSequence)
Sets the value of valueSequence with the key keySymbol. Returns self.
atRemove(keySymbol)
Removes the specified key. Returns self
cursor
Returns a new cursor to enumerate the receiver.
headerPid
Returns the headerPid number.
size
Returns the number of keys in the receiver.
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