ra_machine: Allow the version/0 callback to return 0
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version/0 callback return a version() typeversion/0 callback to return 0
[Why] 0 is now a valid value the `version/0` callback can return. It has always been a valid value, but the callback couldn't return that. This allows a Ra machine module to explicitly set the initial version, even though it is the default implicit one. [How] The `assert_integer/1` function, renamed to `assert_version/1` in the progress, now accepts 0 as a valid value. The `version/0` callback spec is improved to return the `version()` type. The `is_versioned/1` helper behavior changes: an unversioned Ra machine is a module which doesn't export the `version/0` callback.
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kjnilsson
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Dec 20, 2023
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Why
0 is now a valid value the
version/0callback can return. It has always been a valid value, but the callback couldn't return that.This allows a Ra machine module to explicitly set the initial version, even though it is the default implicit one.
How
The
assert_integer/1function, renamed toassert_version/1in the progress, now accepts 0 as a valid value.The
version/0callback spec is improved to return theversion()type.The
is_versioned/1helper behavior changes: an unversioned Ra machine is a module which doesn't export theversion/0callback.