Convert all S3 to S7?

[msberends]

Description

R is moving towards a new object oriented programming system designed to be a successor to S3 and S4, called S7 (CRAN, website).

Important limitations:

• Relies on R v3.5 or higher (released April 2018) while we rely now on R v3.0 or higher (released April 2013)
• Although used by ggplot2 v4.0.0 already, the S7 pkg is still on v0.2.0 suggesting it's not a stable release yet

Use Case (optional)

More robust for all our implementations of mo, ab, mic, disk, ab_selector, etc.

[msberends]

Their website as of today:

S7 is somewhat experimental; we are confident in the design but it has relatively little usage in the wild currently. We hope to avoid any major breaking changes, but reserve the right if we discover major problems.

Therefore, this will be backlog for at least another year.