class Puma::Binder

def create_inherited_fds(env_hash)
  env_hash.select {|k,v| k =~ /PUMA_INHERIT_\d+/}.each do |_k, v|
    fd, url = v.split(":", 2)
    @inherited_fds[url] = fd.to_i
  end.keys # pass keys back for removal
end