A stop-gap solution for this issue was introduced in ERC 5.6 as
`erc-server-delayed-check-reconnect', a new function value for the
option `erc-server-reconnect-function'. There's since been some
criticism regarding its lack of discoverability, despite it featuring in
the Sample Configuration of ERC's manual. It's therefore been suggested
we favor the behavior it enables whenever possible by detecting
compatible values of `erc-server-connect-function'. Any false negatives
will hopefully only affect advanced users with nonstandard connectors.
The following patch tries to implement this. Feedback welcome.

Thanks.