v4.0.1-beta.8

NOTE: We're aiming for a stable 4.0 to be released as soon as possible. To get there, we're releasing new versions quite frequently now. Reason: splitting up major changes into smaller releases allows users to revert versions in steps rather than the whole version.

Changed Version Handling (See PR #1880)

• Dexie will now accept upgrading schema WITHOUT incrementing the version number
• Dexie will now be able to open a previous version of the database without complaining

Version numbering is now only useful when you need to:

• ...migrate the data (attaching an .upgrade() onto a version.
• ...delete tables

Other issues:

• Fix issue with BigInt64Array (#1890)