zd: Specify size of dict when serializing
Some formats/encoders (e.g bincode) need the size of the map before they can serialize so this fix makes it possible to use types using SerializeDict with these formats.
Fixes #274 (closed).
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Some formats/encoders (e.g bincode) need the size of the map before they can serialize so this fix makes it possible to use types using SerializeDict with these formats.
Fixes #274 (closed).