[BUG] `maxall[]` and friends return nonsense without input

[yaisog]

Describe the bug

Some operators return unexpected results when used without input, e.g. [filter that can return nothing] +[maxall[]].
In particular,
sum[] - currently returns 0
product[] - currently returns 1
maxall[] - currently returns -Infinity
minall[] - currently returns Infinity
average[] - currently returns NaN
variance[] - currently returns NaN
standard-deviation[] - currently returns NaN

Expected behavior

I think that according to normal usage, all of these should return nothing in this situation.

A fix could be pretty straightforward, but would not be backwards compatible. Alternatively, we could add a parameter to each with a default value for such situations, but that is really ugly.

To Reproduce

1. Go to tiddlywiki.com
2. Go to $:/AdvancedSearch → Filter
3. Enter +[maxall[]]
4. Observe the result "-Infinity"

Screenshots

No response

TiddlyWiki Configuration

• Version 5.3.8

Additional context

No response

[Jermolene]

Hi @yaisog I agree the current behaviour is problematic. I think it would be a reasonable fix for v5.4.0 because while not fully backwards compatible, it's hard to imagine any real life code relying on the current behaviour.