Mention Nullable in Style Guide section about type Unions #10551
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With Nullable, the main drawback of this kind of field (type instability) goes away, so mention it as a last resort solution. Make the title more imperative since type Unions can always be avoided by using a Nullable field. [av skip]
Update helpdb.jl. [av skip]
JeffBezanson
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Mar 19, 2015
Mention Nullable in Style Guide section about type Unions
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