Distinguishing arrows crossing each other

[Avamander]

It would be incredibly useful if one could use Unicode characters in the range for different-styled arrows or at least "arrow crossings". (This could also be done with colors, but both approaches can work together).

Such as

                          
         ┌─────┐          
         │ Baz │          
         └──╥──┘          
            ║             
  ┌─────┐   ║    ┌─────┐  
  │ Foo ├───╫───►│ Bar │  
  └─────┘   ║    └─────┘  
            ▼             
         ┌─────┐          
         │ For │          
         └─────┘          
                          

or

                          
         ┌─────┐          
         │ Baz │          
         └──┬──┘          
            │             
  ┌─────┐   │    ┌─────┐  
  │ Foo ├───⎶───►│ Bar │  
  └─────┘   │    └─────┘  
            ▼             
         ┌─────┐          
         │ For │          
         └─────┘          
                          

[lewish]

What a lovely suggestion — the examples are really clear! Using ╫ or ⎶ for arrow crossings would make complex diagrams much more readable.

This is related to the broader line/border customisation in #241, but arrow crossings are a distinct enough feature to track here. We'll keep this open. Thanks for the detailed examples!