texmath-0.13.3.4: test/writer/starmath/script_signs_and_arithmetic.test
<<< tex
r_{j,+}+r_{j,-}+r_{j,\pm}+x^{-1}+x^{n-1}+x^{-}+x^{+}
>>> starmath
r_{j, +{}} + r_{j, -{}} + r_{j, plusminus {}} + x^{- 1} + x^{n - 1} + x^{{}-{}} + x^{{}+{}}
<<< tex
r_{j,+}+r_{j,-}+r_{j,\pm}+x^{-1}+x^{n-1}+x^{-}+x^{+}
>>> starmath
r_{j, +{}} + r_{j, -{}} + r_{j, plusminus {}} + x^{- 1} + x^{n - 1} + x^{{}-{}} + x^{{}+{}}