Do not set SO_LINGER by default #110
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This should fix a number of 'freeze' related issues on larger instances, particularly those behind network layer load balancers.
The origin of setting
SO_LINGERdates way back to the earliest days of Thousand Island, and the original reasoning for it is lost to the ages. We're in good company by removing it though; it's an odd choice for a socket library and eg. ranch doesn't set it by default either.