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Supporting a trailing comma in NM_MAKE_STRV() can be desirable, because it
allows to extend the code with less noise in the diff.
Now, there may or may not be a trailing comma at the end.
There is a downside to this: the following no longer work:
const char *const v1[] = NM_MAKE_STRV ("a", "b");
const char *const v2[3] = NM_MAKE_STRV ("a", "b");
but then, above can be written more simply already as:
const char *const v1[] = { "a", "b", NULL };
const char *const v2[3] = { "a", "b" };
so the fact that the macro won't work in that case may be preferable,
because it forces you to use the already existing better variant.
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