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fix(connection): default family to undefined rather than 4
#230
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Upon closer inspection, #183 was actually very much backwards breaking and should not have been merged. This issue causes Automattic/mongoose#5760 via Automattic/mongoose@93e771c .
The problem with #183 is that
net.createConnection()callsdns.lookup()with thefamilyoption always set. If thefamilyoption is not set,dns.lookup()will return both ipv4 and ipv6 addresses, but since mongodb-core always setsfamilynow, the driver can only connect to ipv4 or ipv6 depending on the value offamily. In particular, this means that any user that was connecting to an ipv6 address now must specifyfamily: 6in porcelain layer >= 2.2.28 and mongoose >= 4.11.6 in order to successfully connect, whereas they didn't have to before.