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sub bracket {
   local $_ = @_ ? $_[0] : $_;
...
      join ',',        # Seperate elements with commas.
      map quote,       # Quote elements.
      @arr;            # Elements.

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sub quote {
   local $_ = @_ ? $_[0] : $_;
...
      join ',',          # Seperate elements with commas.
      map quote,         # Quote elements.
      @arr;              # Elements.