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It should just be an option to make a library or a whole site default open in read only mode.
Ecatly to avoid in intentional changes when just viewing a document.
Microsoft, this must be an easy change to implement, and can just be a radio button in the library and/or site settings.
Please do this now! It is preventing me rolling out versioning and autosave to a whole team of engineers who are worried about accidentally modifying documents.