When is ipset's "resize 0" used?

["JC Janos" <jcjanos245@xxxxxxxxx>]

>From the ipset "tips & examples" ,

  If you want a fixed size iphash type of set, then define it with
zero valued resize parameter:
  ipset -N foo iphash --resize 0

Would this be used for a constant/unchanging ipset, e.g. containing 25
IPs that won't be addded to or changed dynamically?  Similar to
OpenBSD's pf "const" table construct,

  table <XXX> const { ip1, ip2, ..., ipN }

?

Also, Does hashsize literally correspond to # of entries?  So, 25
entries would need only hashsize=25?

Thanks.

--JC
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