Generally software follows the convention that "x.0" means a major rewrite, "x.5" means it's a substantial upgrade but not a major rewrite, intermediate decimals are "feature releases" that add capabilities to existing code, and "x.0x" releases are bug fixes.
Then there's Microsoft and some others who try to avoid the convention altogether... so there are no hard and fast rules.
/Does this for a living
//Likes the way Jelsoft does it
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