Should the "subject alternative name" property of an X509 certificate be set to critical?

I'm writing a tool to generate self-signed X509 certificates and X509 certificate requests and I'm wondering how the "critical" property of the SubjectAlternativeName (OID 2.5.29.17) should be handeled. The documentation isn't too clear for me.

Should I:

• Make it critical
• Make it non-critical
• Let the user decide
• Ask the question on stackoverflow instead ?

Thanks