This is a follow up on PR #8172 and a breaking change that allows NewPoller to take an options struct.
The issue with the previous PR was that NewPoller immediately initializes the underlying os implementation
and therefore setting IncludeLocalhost as an exported field happened too late and cannot happen early enough.
Using the zero value of Poller was also not an option from outside of the package because we need to set initial
private fields
Fixes#8171
Signed-off-by: Marwan Sulaiman <marwan@tailscale.com>
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