[Kirby, Panel] Number field won’t save four digits

[robinscholz]

Describe the bug The number field won‘t save more than three digits. Two and three are fine, but trying to save anything more than three digits results in only the first digit being saved.

To reproduce Steps to reproduce the behavior:

1. Download the starterkit
2. Add a number field too the files/image.yml blueprint

   title: Image
   columns:
   - width: 1/2
   sections:
     content:
       type: fields
       fields:
         caption:
           label: Caption
           type: textarea
           size: medium
         year:
           type: number
           label: Jahr
           width: 1/2
   - width: 1/2
   sections:
     meta:
       type: fields
       fields:
         alt:
           label: Alternative Text
           type: text
         photographer:
           label: Photogapher
           type: text
           width: 2/3
         license:
           label: License
           type: select
           width: 1/3
           options:
             - Unsplash
             - CC BY 4.0
             - CC BY-SA 4.0
             - CC BY-NC 4.0
             - CC BY-ND 4.0
         link:
           label: Link
           type: url

3. Find a file and try entering a year (i.e. 2017)
4. See error

Expected behavior Save all digits of the input.

Kirby Version 3.0.2.

Desktop (please complete the following information):

• OS: macOS
• Browser Chrome
• Version 74.0.3710.0 (Official Build) dev (64-bit)

[bastianallgeier]

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