REF: styler.to_latex siunitx changes: render {} only when needed. #43397
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adds item on #41649 for better backwards compat, and this is probably slightly better anyway.
When:
siunitx=Truecolumns headers are now rendered like{} & {A} & {B} \\siunitx=False(default) then they are now rendered like& A & B \\Rndering column headers with or without curly braces has no effect in the LaTeX output, except when using
siunitxwhere they are required for it to work properly.