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internal/calc gets its own tokenizer and precedence-climbing parser in place of go/parser, which cannot express a power operator; go/constant still computes. ^ (also **) binds tighter than * / % and a sign on its left, and groups to the right. % takes the sign of the divisor and is exact on decimals. A whole exponent is computed exactly while the result's numerator and denominator stay within 4096 bits; otherwise, and for a fractional exponent, in float64. A remainder, or the sign of a negative base's power, that depends on a value go/constant holds rounded is refused as too large. The welcome text and the replies mention the new operators; a negative base with a fractional exponent gets its own reply. Model: opus-5-5