Michel Lang

Use log1p(x) instead of log(1+x)

1

`log1p` is numerically accurate for small `x` with `1 + x == 1`: ```r x = 1e-20 log(1 + x) log1p(x) ```

Add tests for backward compatibility

2

We should store snapshots of learners trained with older versions of mlr3 and predict with them in the unit tests to ensure backward compatibility.

A primary key is not helping w.r.t. performance; instead, insert the data sorted. https://duckdb.org/docs/guides/performance/overview

Fixes #30

To work with really large data bases.

The `ref()` function is more robust when it comes to renames (works with aliases, throws an error instead of creating broken links).

Some blog posts start with a series of `library()` calls. Many of them are not required because their namespace is loaded automatically. Examples are `smotefamiliy`, `mlr3misc` or `mlr3data`.

We should try to find a unified style for the titles of the posts. They looks a bit chaotic ATM.