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For legibility, ease of development, and to make field names easier to remember, Magnolia 5.7 changed this in two ways:

• You no longer need to define specify the field type using the fully qualified class name. You need to set just the field name proper via the fieldType property.
• In selected modules (see the Short field names list below on this page), the field name does not even require the -Field or -FieldDefiniton suffix. 

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