v5.9.7

What's Changed

• Detect form-in-form situation and give warning by @takayukister in #1444
• Apply maxitems=1 validation by @takayukister in #1446
• Increase default maxlength by @takayukister in #1448
• Prepare for 5.9.7 release by @takayukister in #1450

Full Changelog: v5.9.6...v5.9.7