ThwartingSupermanIII (Add flag to change truncation behavior for decimal parameters)
This turned out to be an issue with the SQL provider, which meant that the idea of having a flag on the context was not really appropriate. The flag has instead been added as a static on SqlProviderServices, with the idea being that an application that depends on this can set the flag at startup and then forget about it, but we can discuss if there is a better place for it.
The underlying issue is in SQL Client where if Scale is set on a SqlParameter object then it will cause the value to be truncated. The SqlParameter documentation says that the truncation behavior should not be relied upon, but it seems very unlikely that it will change. The recommended approach is to not set Scale at all for input parameters, which is what EF now does when the flag is set.
We may want to discuss again the value of changing the default to not truncate. This is a breaking change for anyone relying on the old behavior that would be hard to detect. On the other hand, not changing the default will likely result in hard to find bugs in new applications and may also fix some existing applications that are not aware of and have not tested for the truncation behavior.
The SQL Compact provider does not appear to have this issue. However, it does always truncate "money" columns, but this appears to be below the level of the provider and there doesn't seem to be a way to influence it from EF.
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