trim_whitespace deletes line jumps from markdown

[WhyNotHugo]

Markdown allows inserting newlines by inserting two spaces at the end of the line.
Without these two spaces, two consecutive lines are considered part of the same.

If I configure the trim_whitespace fixer like so:

vim.g.ale_fixers = {
  -- ...
  ["*"] = { "remove_trailing_lines", "trim_whitespace" },
}

Then the fixer also removes double spaces at the end of the line in markdown files. These are significant and removing them changes how the file is rendered.

How can I prevent this from happening? Note that I do want to remove single spaces at the end of a line for markdown (and every other filetype too).

[WhyNotHugo]

Oh, re-reading the README for like the fifth time, I notice:

A * in place of the filetype will apply a List of fixers to all files which do not match some filetype in the Dictionary.

The following works:

vim.g.ale_fixers = {
  -- ...
    markdown = {}, -- Disables trim_whitespace.
  ["*"] = { "remove_trailing_lines", "trim_whitespace" },
}

[WhyNotHugo]

This still won't let me remove single-trailing space from markdown.