In https://gpuweb.github.io/gpuweb/#abstract-opdef-to-a-texel-value-of-texture-format one of the steps is

"Convert wgslColor to format using the same conversion rules as the § 23.3.7 Output Merging step, and return the result."

But the Output Merging section says nothing about how that conversion is done, and instead has a note to "fill out this section".

The conversion process should be described normatively somewhere.