Inada Naoki <songofaca...@gmail.com> added the comment:

I don' think they are modern-style vs legacy-style.

When explicit default value is present, the default value is documented in 
signature like `param=42`.
On the other hand, when default value is not explicit (just an placeholder), 
the parameter is expressed using optional group `[param]`.

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nosy: +inada.naoki

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<https://bugs.python.org/issue36490>
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