PiAPD calculates π to the desired precision using github.com/cockroachdb/apd.

PiDecimal_GDA calculates π to the desired precision using github.com/ericlagergren/decimal with the operating mode set to GDA.

PiDecimal_Go calculates π to the desired precision using github.com/ericlagergren/decimal with the operating mode set to Go.

PiDnum calculates π to its maximum precision of 16 digits using github.com/apmckinlay/gsuneido/util/dnum.

PiFloat calculates π to its maximum precision of 19 digits using Go's native float64.

PiInf calculates π to the desired precision using gopkg.in/inf.v0.

PiShopSpring calculates π to the desired precision using github.com/shopspring/decimal.