Question: how can i use custom zoom level?

[Connorthe1]

Hello, thank for a great plugin, can you help me for creating zoom levels instead of wheel percent value?
For example i need array of levels [1, 5, 10, 15, 20] (in percents) and wheel event can only switch between this values. How can I make it?
The only thing I found was a percentage change in wheel() which results in (1.99999999) values and depending on the mouse settings in windows this percentage can be different, which does not quite work for me