Implement read_managed_str for the JSON deserialiser. #4159
  Add this suggestion to a batch that can be applied as a single commit.
  This suggestion is invalid because no changes were made to the code.
  Suggestions cannot be applied while the pull request is closed.
  Suggestions cannot be applied while viewing a subset of changes.
  Only one suggestion per line can be applied in a batch.
  Add this suggestion to a batch that can be applied as a single commit.
  Applying suggestions on deleted lines is not supported.
  You must change the existing code in this line in order to create a valid suggestion.
  Outdated suggestions cannot be applied.
  This suggestion has been applied or marked resolved.
  Suggestions cannot be applied from pending reviews.
  Suggestions cannot be applied on multi-line comments.
  Suggestions cannot be applied while the pull request is queued to merge.
  Suggestion cannot be applied right now. Please check back later.
  
    
  
    
I noticed that there is now a
.to_managedmethod to convert a~strto a@str, so use this to implement the last method of the JSON deserialiser.It mentions #3604, but this doesn't fix that issue.
(PS. I'm new here; I've read the notes for developers on the wiki, but it's entirely feasible that I'm making mistakes anyway. Sorry!)