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to emphasize idempotence

![](http://m.memegen.com/77n7dk.jpg)

Important bugfix. Otherwise bitswap cannot message peers
the node has not connected to yet :(

Rather than pushing errors back down to lower layers, propagate the
errors upward.

This commit adds a `ReceiveError` method to BitSwap's network receiver.

Still TODO: rm the error return value from:

    net.service.handler.HandleMessage

This is inspired by delegation patterns in found in the wild.

to avoid letting client rely on order for correctness