strconv: rounding #55056
Description
What version of Go are you using (go version)?
$ go version go version go1.19.1 darwin/arm64
Does this issue reproduce with the latest release?
This is the latest re
What operating system and processor architecture are you using (go env)?
go env Output
$ go env GO111MODULE="on" GOARCH="arm64" GOBIN="" GOCACHE= GOENV= GOEXE="" GOEXPERIMENT="" GOFLAGS="" GOHOSTARCH="arm64" GOHOSTOS="darwin" GOINSECURE="" GOMODCACHE="/Users/jroper/go/pkg/mod" GONOPROXY="" GONOSUMDB="" GOOS="darwin" GOPATH="/Users/jroper/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= 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/ky/_xmwdrp16cg45kk2znpb0xqc0000gn/T/go-build2189227028=/tmp/go-build -gno-record-gcc-switches -fno-common"
What did you do?
See https://go.dev/play/p/8_0ETuSnOcj
I used the strconv to convert a string of a (very large) float to a float.
What did you expect to see?
I was hoping to either see the original value, or an error if some floating point precision had been lost. For the example provided, I hoped that either 9999999999999905 would be the returned number, or that I would get an error.
What did you see instead?
9999999999999904, and no error.