Squiggly heredoc - new feature request

[Přemysl Šťastný]

Hello.

I have a problem with indentation in bash scripts with here documents. 
Normally, I use spaces for indentation, eg.

func()(
  blabla
)

But if need to use here doc document in a function, I am forced to do eather

func()(
  cat <<- EOF
        blabla
        EOF
)

or

func()(
  cat << EOF
blabla
EOF
)

I think, it would be nice, if you implemented Squiggly heredoc, which 
solves this problem by ignoring both leading spaces and leading tabs. eg.

func()(
  cat <<~ EOF
    blabla
  EOF
)

Would it be possible please? If I get your approval, I can implement it 
to bash myself.

Thanks.

Best regards
Přemysl Šťastný

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