GitLab

It causes lots of line changes, but it would be confusing to keep the
current state over long term.

also some cleanup and version bump to Q2

this prepares cache/txn structures to hold API as well, so we can get
rid of the global api

this allows for continuation of a function in the background,
a good use case for this is loading of chunks of data or I/O 

module api can now store userdata, e.g. owner

if the module declares such properties, they can be accessed
by treating module as a table, e.g.

hints[‘localhost’] = ‘127.0.0.1’
hints.hostname = ‘192.168.1.1.
print(hints.localhost)

equals to:
hints.set(‘localhost 127.0.0.1’)
hints.set(‘hostname 192.168.1.1’)
print(hints.get(‘localhost’))

extracted part about writing layers to lib documentation