Zig 0.14+ can directly compare packed structs.

src/terminal/style.zig

@@ -85,7 +85,7 @@ pub const Style = struct {
 
     /// True if the style is equal to another style.
     pub fn eql(self: Style, other: Style) bool {
-        return @as(u16, @bitCast(self.flags)) == @as(u16, @bitCast(other.flags)) and
+        return self.flags == other.flags and
             std.meta.eql(self.fg_color, other.fg_color) and
             std.meta.eql(self.bg_color, other.bg_color) and
             std.meta.eql(self.underline_color, other.underline_color);