pub const OsVersion = union(enum) {
    none: void,
    semver: SemanticVersion,
    windows: Target.Os.WindowsVersion,

    pub fn eql(a: OsVersion, b: OsVersion) bool {
        const Tag = @typeInfo(OsVersion).@"union".tag_type.?;
        const a_tag: Tag = a;
        const b_tag: Tag = b;
        if (a_tag != b_tag) return false;
        return switch (a) {
            .none => true,
            .semver => |a_semver| a_semver.order(b.semver) == .eq,
            .windows => |a_windows| a_windows == b.windows,
        };
    }

    pub fn eqlOpt(a: ?OsVersion, b: ?OsVersion) bool {
        if (a == null and b == null) return true;
        if (a == null or b == null) return false;
        return OsVersion.eql(a.?, b.?);
    }
}