How to reproduce:

• In a content type, have a repeater and a multiple long or double data in this repeater
• Create a content of this type and add an entry to the repeater
• In a solr search, search the content of the content type and put the repeater in columns
• Click on the repeater column, change a data (the multiple long or another data) and click on ok to validate your modification
• In the yellow ribbon, click on save button
• An error occur because "[]" can not be convert as a Long (or Double) => KO

I think we have same kind of issu with complex data (geocode, user, multilingual strings, ...)