{{ "_­_" | warnf "%[1]v (%[1]T)" }} --> ­ (string)
{{ "_­_" | htmlUnescape | warnf "%[1]v (%[1]T)" }}  --> _ ­_ (string)

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OK, I see it now. Reopening.

First, the plainify function removes HTML tags (e.g., <strong>), not HTML entities (e.g., &). It is doing the right thing.

Second, the htmlUnescape function "returns the given string with HTML escape codes un-escaped." This function is also doing the right thing.

So, there's no bug here, but possibly an enhancement: create a template function that removes non-printable characters. This gets a bit tricky because sometimes you may want to remove them, and at other times replace them with a space (e.g., tab should be replaced by space, but zero-width space should not). I think these would have to be special-cased.

For now I think you have three options:

1. Use the replace function
2. Use the replaceRE function
3. Create a partial function that contains a slice of HTML entities to remove or replace.

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Still relevant