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Google has made some updates to the meta robots directive help documentation, specifically by adding more examples for the max-snippet and specifying for each tag what Google’s default behavior is when the tags are omitted. I highly recommend you re-review these docs starting from the valid indexing & serving directives until the end of that section.
Here are side by side screen shots of the old and the new version if you want to review what changed:
OLD (click to enlarge):
NEW (click to enlarge):
Forum discussion at Twitter.