Column type change in MSSQLServer

[luis100]

When round-trip testing from MSSQLServer to SIARD and back, the following changes occurred on the column data types:

• [bigint] became [decimal](19, 0)
• [nvarchar](max) became [text]
• [nvarchar](50) became [varchar](50)
• [datetime] became [datetime2](7)
• [tinyint] became [smallint]