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[hist] Use correct rounding for parameters in TFormula::GetExpFormula
See https://root-forum.cern.ch/t/tformula-getexpformula-parameter-rounding/50232
Is this still an issue? Is there a strategy forward?
@lmoneta ping
Related: https://stackoverflow.com/questions/15192948/c-dynamically-printf-double-no-loss-of-precision-and-no-trailing-zeroes