uid not showing up in exported features

I was testing osmium (3.0.0) objects and had 2 questions about this case:

import osmium

fields = osmium.osm.mutable.OSMObject(
    id=123, version=2, visible=True, uid=123, changeset=3212312, timestamp="2015-03-16T04:45:49Z", tags={"maxspeed": "50"}
)

way = osmium.osm.mutable.Way(fields, [])
writer = osmium.SimpleWriter('./output.pbf')
writer.add_way(way)
writer.close()

Converting the PBF file back into OPL yields

<?xml version='1.0' encoding='UTF-8'?>
<osm version="0.6" generator="osmconvert 0.8.10">
	<way id="123" version="2" timestamp="2015-03-16T04:45:49Z" changeset="3212312">
		<tag k="maxspeed" v="50"/>
	</way>
</osm>

• Why is the uid not showing up in the way feature?
• The constructor for mutable objects doesn’t take the user, is that because this can be changed easily (but uid doesn’t)? Is there a way to get the user passed in the OSMObject? (I did notice it exists in the osmium.osm.OSMObject)

[lonvia]

I have planned to do a release in the next days anyway. It will contain the fix.

[l-r]

@lonvia what is the release process after a small fix like this?