Can I receive most recently two value when a new v...

# coroutines

[Simon Lin]

Can I receive most recently two value when a new value emit? for example:

emit: 1, 2, 3, 4, 5, 6
downstream receive: [initValue, 1] [1, 2] [2, 3] [3, 4] [4, 5] [5, 6]
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