BibLaTeX translator and mvbook entry type

Gracile
The BibLaTeX translator convertsa book which has its volume field filled into a multi-volume entry type @mvbook
This is a confusionbetween (number of) volumesand volume.

A @mvbookshould be created only if the # of Volumes(numberOfVolumes) field is filled.A @mvbookis not one of the individual volumes of a multi-volume book but the multi-volume book itself.

The BibLaTeX documentationhas some clear examples:
p. 8:
multi-volume @book.For backwards compatibility, multi-volume books are also supported by the entry type @book.However, it is advisable to make use of the dedicated entry type @mvbook.
p. 32:
2.3.5 Titles
The following examples demonstrate how to handle different types of titles.Let's start with a five-volume work which is referred to as a whole:
@MvBook{works,
author = {Shakespeare, William},
title = {Collected Works},
volumes= {5},
...

The individual volumes of a multi-volume work usually have a title of their own.
Suppose the fourth volume of the Collected Works includes Shakespeare's sonnets and we are referring to this volume only:
@Book{works:4,
author = {Shakespeare, William},
maintitle = {Collected Works},
title = {Sonnets},
volume = {4},
...
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