All of our instances are reported as launched on ubuntu-core-18 now, due to strict confinement and base: core18. We should try and find a way to reach out to get the actual host OS.

https://github.com/canonical/multipass/blob/d9a72641a254a0613fe4344aa3cb93a67a6b055b/src/daemon/daemon.cpp#L116-L117

Using the following YAML should output warnings per offending spec instead of ignoring them silently.
Example:

footloose create
WARN[0000] Options under "spec.ignite" for "manager-%d" are ignored when using the "docker" backend
WARN[0000] Options under "spec.ignite" for "worker-%d" are ignored when using the "docker" backend
INFO[0000] Docker Image: quay.io/footloose/ubuntu18.04 prese

Some old programs versions can be found here if someone needs them to test old exploits for instance.

Lots of methods in Common have to do with numbers. We sometimes convert BNs to numbers (for instance block numbers) and feed those to Common. Common should support inputs where this input is of type BN and should also handle arithmetic as BN. We can keep supporting numbers by internally converting it to BN and then feeding it to the same method which handles the input as BN.