🐛 Bug Report

I wasn't quite sure if this would be a bug or a feature improvement, but I noticed that the jump from 3.8.2 to 3.9.0 lead to an increase of 156 kb, or 36kb gzipped, of the size of the library.

You can also see this here:
https://bundlephobia.com/result?p=exceljs@3.9.0

From scanning the commits, it is not clear to me what feature lead to this quite massive increase - I am also not sure if that was "on purpose" or just happened somehow.

Lib version: 3.9.0

Steps To Reproduce

See: https://bundlephobia.com/result?p=exceljs@3.9.0
Which was also confirmed by our CI, which shows the bundle size increasing massively.

The expected behaviour:

A minor version bump that is not introducing massive new features shouldn't increase the bundle size by over 150 kb.

Possible solution (optional, but very helpful):

• What exactly lead to this bundle size increase?