Why do programs written with the Go programming language, including podman and cri-o, ignore proxy configuration when a "#" character is in the username or password for the proxy?

Issue

• We have provided proxy information with the environment variables HTTP_PROXY and HTTPS_PROXY.
• As an example, we have specified a plaintext username and password like so:

export HTTP_PROXY='myuser:my!pass#word@proxy.example.com:3128'
export HTTPS_PROXY='myuser:my!pass#word@proxy.example.com:3128'

• When utilizing proxy information with any program built with Go, including but not limited to podman, buildah, skopeo, or cri-o, proxy information is read from the above variables but not used specifically if there is a # character in the username or password of the proxy.
• If the # character is used in the username or password, the program built and compiled with Go will ignore proxy information. Why is this?