refs: https://github.com/TryGhost/Team/issues/759
- No matter what, a handlebars helper outputs a string. So if you return true, you'll always get 'true'.
- SafeStrings are handlebars's way of passing around a string whilst also maintaining a record of the original value e.g. new SafeString(true) results in {string: true}
- We need this for the match helper, so that we know when doing a comparison that we're meant to be comparing against a boolean true, not a string true
- Therefore, we need to putput SafeStrings, but also process them when passed in
The logic
- Figuring out the correct logic here has been a little tricky but essentially:
- {{match safestring}} with a single arg, will return true for any truthy value
- {{match safestring "=" true}} does a direct comparison with the original value of the safe string, so if it was a boolean true, the match will be true else false
- {{match (match something) "=" true}} will therefore work for any level of nesting
- this can result in slightly inconsistent results, but feels correct and documentable
This is documented extensively through the test cases
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