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lang-tex
subsn()as in OP in\xintNewFloatExprbut I have realized since this is inefficient because the value of "h" in terms of "x" will be recalculated at each occurrence of "h" in a power "h^2", "h^3", etc... The new version uses\xintdeffloatfuncfor a two-variable function as auxiliary.subsn()is also there if one uses it inside\xintdeffloatfuncit is not only with\xintNewFloatExpr. Looks like an intrinsic limitation of xint regarding to thissubsn()thing ! Used directly it makes the substitution but inside a function it does not know to compute only once the substituted value... probably an issue to raise withxintmaintainer.\mathrm{d}tshould not be part of the exponent.