The 5 issues for us that made updating to the latest not an easy drop in was

• The change to using === when comparing radio values.
  https://github.com/knockout/knockout/blob/v3.0.0/src/binding/defaultBindings/checked.js#L64
  https://github.com/knockout/knockout/blob/v2.3.0/src/binding/defaultBindings/checked.js#L40
• Having valueAllowUnset default to false
• Throwing errors for already bound; vs ignoring them
• Throwing errors for "Cannot find template with ID"; vs ignoring them (Single Page Application)
• Have value = undefined; if it doesn't match a given value in the select dropdown list.

I made the first 4 issues be options and the 5th one the default behavior as select lists are broken if you populate it with a value that's not in the options.

window.knockout_globals = {
  'valueAllowUnset': true,
  'useStrictEqualityRadioCheckbox': false,
  'alreadyBoundErrorLevel': 0,
  'selectFirstWhenUnset': true,
  'suppressTemplateError': true,
};