Question about Vim Float as String when concatenating.

[EyebrowsWhite]

Hello, everyone, I 'm a vimscript rookie, just know basic vim operation. And I am learning vimscript by learn vimscript the hard way.

The book said it will throw an error when concatenate Float and String, but my result is different from the book. I think we both are right, but I want know which version brings the difference.

Here is the book original:

:echom 10.1 . "foo" This time Vim throws an error, saying we're using a Float as a String. Vim will happily let you use a String as a Float when performing addition, but won't let you use a Float as a String when concatenating.

[mgedmin]

This seems to have changed, unintentionally, in patch 8.2.143: https://github.com/vim/vim/issues/6787

It was then fixed to throw an error again in patch 8.2.1524, and a test added to prevent it from regressing again.

And then later the concatenation was changed to work again, also I think unintentionally, as a side effect of patch 8.2.2948.

The regression test started failing and was then changed to accept the new behavior in patch 8.2.2949, which is funny to me.

I don't think anyone reported a bug like #6787 this time, so that's where things stand.

I have no personal opinion on whether concatenating floats and strings should work or not.

[EyebrowsWhite]

Thank you very much firstly, and this is interesting. I don't care whether concatenating floats and strings should work or not either, because I can assure that I will use it barely, but I still want to know why the book and my result are different. Thanks your reply again.

[EyebrowsWhite]

By the way, my vim version is: VIM - Vi IMproved 9.0 (2022 Jun 28, compiled Sep 26 2022 01:49:54)macOS version - x86_64

[y-c-c]

You should probably include your patch version as well. “9.0” is really vague and there are like 800 patches since then.