# Functions
New returns a new empty PEXList.
NewWithRecentlySeen returns a new PEXList with given peers added to the dropped part.
# Constants
MaxLength is the maximum number of items to keep in the RecentlySeen list.
# Structs
PEXList contains the list of peer address for sending them to a peer at certain interval.
RecentlySeen is a peer address list that keeps the last `MaxLength` items.