Join Float Lists

Join Float Lists does one thing: takes two lists of floats and concatenates them into one. In1 first, then In2, out through Joined. That's it. If you've used the pack's Join Image Lists or Join List Any, this is the stripped-down float-only version - and notably, it only has two inputs and no Sizes output, so there's less to trip over.

When is gluing two float lists actually useful? Mostly when a sweep you want doesn't come from a single range. Say you want to test CFG at 4, 5, 6 and 9, 10 - the low end with fine steps and the high end coarse. Two Range nodes give you [4,5,6] and [9,10], and this node hands you one clean [4,5,6,9,10] to feed a sampler or the numeric axis of XYAny. Without a join node you'd either hand-type the combined list or wire two parallel paths into whatever consumes it - and with ComfyUI's list semantics, one combined list is usually the tidier route.

The two inputs are both marked forceInput, meaning you can't just type a number in the box - you're expected to wire something in (a Range node, another join, a value from elsewhere). That's intentional and consistent with how this pack treats lists: the inputs are data, not settings.

It's list-aware, so if In1 and In2 are both lists, they concatenate in order. If you connect a single float, it's treated as a one-element list and gets appended accordingly. The output is a proper FLOAT list, OUTPUT_IS_LIST, ready for anything that consumes a float sweep.

There's no trick to this node and no real failure mode to warn you about - the only way to be surprised is to expect Sizes (like the image/any joins give you) and find it's not here. It's a utility in the truest sense: boring, reliable, and exactly as long as it needs to be.

Install is the same for the entire Comfy_KepListStuff pack - no dependencies beyond what ComfyUI bundles, no models:

cd ComfyUI/custom_nodes
git clone https://github.com/M1kep/Comfy_KepListStuff

Restart ComfyUI or install Comfy_KepListStuff via Manager; it's under List Stuff. Wire in two float lists, get one.