int64 casting returns different result based on GOARCH

[gohumble]

What version of Go are you using (go version)?

$ go version go1.19.1 darwin/arm64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE="on"
GOARCH="arm64"
GOBIN=""
GOCACHE="/Users/humble/Library/Caches/go-build"
GOENV="/Users/humble/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/humble/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/humble/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_arm64"
GOVCS=""
GOVERSION="go1.19.1"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/tt/fs3zvlp53cgf_dtv5hhyc6cc0000gn/T/go-build2158361161=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Found some compatibility issues with arm64 and amd64
Due to this, I have changed all int64 amounts to uint64 to prevent this "bug".

Another solution would be reducing the MAX_ORDER of mints to 63

Script

package main

import (
	"fmt"
	"math"
)

func main() {
	pow := math.Pow(float64(2), float64(64))
	inti := int64(pow)
	fmt.Println(inti)
}

Casting int64 returns different results based on GOARCH.

~/go/src/github.com/gohumble/cashu-feni arm_amd*                                                                                                                                                       14:58:24
❯ go run cmd/cashu/test.go 
9223372036854775807

~/go/src/github.com/gohumble/cashu-feni arm_amd*                                                                                                                                                       14:58:34
❯ GOARCH=amd64 go run cmd/cashu/test.go
-9223372036854775808

What did you expect to see?

amd64 build should return the same int64 value

What did you see instead?

amd64 builds return different int64 values

[gohumble]

temporarily fixed in #31 by using uint64 instead of int64.