Grokking Advanced Go
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API Design and Major Versions

When a Go module moves from v1.4.0 to v1.5.0, its author makes several promises to everyone who imports it, and declines to make others.

Promised:

  • Code that compiled against v1.4.0 still compiles, with a few narrow exceptions described below.
  • Exported names keep their meaning.
  • The import path stays the same.

Not promised:

  • That unexported names, or anything in internal, stay the same.
  • That code which depends on undocumented behavior keeps working.
  • That anything at all stays stable if the version starts with v0.

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