> Regardless, a ninth note (e.g. 9 Introduced in v5.34.0.) would add clarity.

Normally I'd say a footnote is overkill, but since there is that note

Note that any escape sequence using braces inside interpolated constructs may have optional blanks (tab or space characters) adjoining with and inside of the braces, as illustrated above by the second \x{ } example.

every "escape sequence using braces" should better have this as footnote plus "(since v5.34.0)"

On a side note, this seems to be in analogy how identifiers inside braces are handled

  DB<70> $a = 42
                                                                      
+                                                                     
+                                                                     
+                  
  DB<71> p ${ a }                                                     
+                                                  
42                                                                    
+                                                  
  DB<72> p ${  a  }                                                   
+                                                  
42                                                                    
+                                                    
  DB<73> p "${  a  }"                                                 
+                                                  
42                                                                    
+                                                    
  DB<74>

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Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Re^4: Problem with escape sequence \x for hex with spaces "\x{ 263A }" by LanX
in thread Problem with escape sequence \x for hex with spaces "\x{ 263A }" by LanX

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