fn testFormat(a: Managed, expected: []const u8) !void
fn testFormat(a: Managed, expected: []const u8) !void { try std.testing.expectFmt(expected, "{f}", .{a}); try std.testing.expectFmt(expected, "{f}", .{a.toMutable()}); try std.testing.expectFmt(expected, "{f}", .{a.toConst()}); }