Add enable option for EVC, with default = false #626
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The tests for the different EVC options were all inter-dependent. This commit makes them independent, all starting from the same DB state using the same command. This makes it much easier to make modifications in these tests without affecting all following tests.
The EVC is a constant source of confusion for users. It should be disabled by default with warning messages when different versions of experiments are used. Users who wants using advanced features of the EVC would still be able to use it by enabling it. Making it false by default is a breaking change and may cause issues to user currently using the EVC. Based on discussion with users there does not seem to have much usage of the EVC so far so this breaking change should be relatively harmless. Avoiding further confusion by making it disabled by default is worth the breaking change.
Why: If the EVC is not enabled, the consumer should always ignore the code changes. It would not make sense to raise an error between 2 trials because user's script code changed while EVC is disabled. How: If EVC is disabled, force ignore_code_changes to True in Consumer.
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[Fixes #547]
The EVC is a constant source of confusion for users. It should be
disabled by default with warning messages when different versions of
experiments are used. Users who wants using advanced features of the EVC
would still be able to use it by enabling it.
Making it false by default is a breaking change and may cause issues to
user currently using the EVC. Based on discussion with users there does
not seem to have much usage of the EVC so far so this breaking change
should be relatively harmless. Avoiding further confusion by making it
disabled by default is worth the breaking change.