Staging publishes with custom "decimal number or integer" page fields fail

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.1.30 EE GA3, 6.1.X EE, 6.2.10 EE GA1, 6.2.X EE, 7.0.1 CE GA2
• Fix Version/s: 6.2.X EE, 7.0.1 CE GA2
• Component/s: Portal Services, Portal Services > Expando
• Labels:
  • ee-ts
  • liferay-fixpack-portal-164-6210
• Branch Version/s:
  6.2.x
• Backported to Branch:
  Committed
• Story Points: 1.25
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/40543

Creating a custom page field with the "Decimal Number or Integer (64-bit)" type (or the similar "Group of Decimal Numbers or Integers (64-bit)" type) and trying to publish a page with it with remote staging will fail.

Steps to reproduce:
1) Enable remote staging between two sites.
2) Define a page custom field with type « decimal number or integer (64-bit) » from the control panel
3) Add a page to the staging site, and fill in the custom field value
4) Publish the site (or just the page) to live
Expected result: the publish is completed successfully
Actual result: the staging publish fails with an error shown in the logs

Reproduced on 6.2.x: 7637303a7f82c6b7113f5936e1c6d07b9876a0b3
Reproduced in master: abaf3435113a9b2618c3c5aa64eaff0c86363729