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Subject: [OASIS Issue Tracker] (ODATA-557) Allow exponential notation for Edm.Decimal


    [ https://issues.oasis-open.org/browse/ODATA-557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=63784#comment-63784 ] 

Ralf Handl commented on ODATA-557:
----------------------------------

Collected feedback from library developers: processing is typically done in two steps
- chop up JSON input into fragments 
- transport fragments into application data container

First step is done via general-purpose JSON parser that accepts any valid JSON input, including numbers in exponential notation.
Second step applies OData rules, e.g. forbidding exponential notation for properties of type Edm.Decimal.

It's relatively easy to relax the checks in the second step.

> Allow exponential notation for Edm.Decimal
> ------------------------------------------
>
>                 Key: ODATA-557
>                 URL: https://issues.oasis-open.org/browse/ODATA-557
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData ABNF Construction Rules, OData ATOM Format, OData CSDL, OData JSON Format, OData Protocol, OData URL Conventions
>    Affects Versions: V4.0_CSD03
>            Reporter: Ralf Handl
>            Assignee: Ralf Handl
>              Labels: AdoptionBlocker
>             Fix For: V4.01_WD01
>
>
> IEEE754 also defines the DECFLOAT data type for high-precision decimal arithmetic. They have 16 or 34 decimal digit mantissas and exponents between -383 and +384 or -6143 and +6144.
> Representing them exactly in current Edm.Decimal would result in at most 34 non-zero digits and several thousand zeroes. This waste can easily be avoided by allowing exponential notation also for Edm.Decimal.



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