is an orderer node technically a peer node? <rpjday@...>

(more nitpicky pedantry ...)

currently perusing the entire section on "peers" under key concepts,
and want to clarify a few things that don't seem clear.

first, in the opening sentence, a fabric network is defined as
consisting "primarily" of peer nodes, which plainly suggests that
there may/will be nodes in a fabric network that are *not* peer nodes
-- is that the implication that that first line is trying to leave
with the reader?

next, while there may be weird corner cases, is it understood that
any meaningful/useful peer node should be hosting at least one ledger
and at least one example of chaincode that has access to that ledger?

third, are endorsing peers in a network a strict subset of the peers
in that network? that is, do endorsing peers still host ledgers and
chaincode as do regular peers, they simply have extra authority to do

finally, are orderer nodes a completely different animal from peer
nodes? it appears that way from that section, but i just want to make
sure, as in -- orderer nodes do not host either ledgers or chaincode.
or can they? can orderer nodes be specialized instances of peer nodes,
or must they necessarily be a distinct set of (non-peer) nodes in the


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