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Technically that would be possible and no big deal, when I consider the codebase.

BUT that might not work out like you expect, especially with windows that have size constraints like the average terminal. They usually prefer full column and rows instead of fractions of it. I thought about decimal places, but discard the idea, because it is as unreliable as the current system. Just wastes more memory.

One major problem is the config, I have no idea how I should distinguish in the config case syntax-wise. Any suggestions?

Yeah good point on the terminal windows but I think a few of them have options that allow you to switch between absolute sizing and fixed cursor height/width these days.

Syntax-wise a couple of ideas spring to mind.

1. Like CSS: "55px" for example. The most flexible as you can mix and match but probably a bit more work for the string splitting.
2. Have an option in the config to indicate whether the dimensions are in percentages or pixels. Less flexible but I can't think of a reason why I'd want to use both pixels and percentages in the same grid setup.

Well, there are some weird patches like the one for urxvt, I just deal with the gaps and applied a even bigger one so that there's always a gap. ;)

1. String splitting would be easy, actually it is worse: The config is plain ruby and '55px' woud be a method call of a method named '55px' and I'd have to use metaprogramming to catch this. And '55%' would be worse. Sizes in quotes could work, but syntax-wise horrible..

2. I barely see why you need absolute values, but trust me people want to mix that, when both percentage and absolute values are possible.

The current format doesn't allow so many ways to specifiy it.

gravity :foobar, [ 100, 100, 100, 100 ]

I could add methods to Numeric to allow e.g. '100.px' or '100.percent', but hacking base classes is gruesome.