replace_fmt("\\frac{x}{y}", x=2, y=3)
replace_fmt("\\frac{x}{y}", x=2, y=3, digits=0)
replace_fmt("\\frac{x}{y}", x=2, y=3, digits=list(0))
replace_fmt("\\frac{x}{y}", x=2, y=3, digits=list(2, y=0))
replace_fmt("\\frac{x}{y}", x="\\\\sum_{i=1}^n x_i", y="\\\\sum_{i=1}^n y_i")
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