The documentation states that Mult is a boolean field, and is "A scale factor used in multiplication before displaying a number." This makes no sense. If it's interpreted as a scale factor, it can't be a Boolean. I assume it's a Number, like the Div field.
Unfortunately, there are stackexchange answers out there that are contributing to misinformation about this:
https://sharepoint.stackexchange.com/questions/115958/is-it-possible-to-create-field-with-defined-internal-name-using-rest-api
Other developers might be incorrectly thinking from the "Mult" name and the documented boolean type that it's a way to create a multiple-valued field.
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The documentation states that Mult is a boolean field, and is "A scale factor used in multiplication before displaying a number." This makes no sense. If it's interpreted as a scale factor, it can't be a Boolean. I assume it's a Number, like the Div field.
Unfortunately, there are stackexchange answers out there that are contributing to misinformation about this:
https://sharepoint.stackexchange.com/questions/115958/is-it-possible-to-create-field-with-defined-internal-name-using-rest-api
Other developers might be incorrectly thinking from the "Mult" name and the documented boolean type that it's a way to create a multiple-valued field.
Document Details
⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.