The RFA documentation describes the RWF length as a caching hint: RWFLEN A caching length hint associated with this field.
Does that mean, that also content is correctly cached even when it extends the RWF_LEN specification in the RDMFieldDictionary ?
Background: The MF PRICE type is usually defined with a length of 17. The RWF translation in the file is REAL64 with a length of 7.
But a length of 7 is not enough to hold all possible values (big numbers/high precision) in RWF encoding.
According to your below answer, all values are correctly encoded. But are these values also correctly cached?
Btw: the same documentation recommends to use a field length of 9 for custom REAL64 fields.
There are a couple of recommendations for custom FIDs:
RWF Type: REAL
RWF Len: 9
Notes: REAL can represent values with fractional denominators, trailing zeros, or up to 14 decimal positions.