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Ignite will provide out-of-box mapping from standard platform types (Java, C#, C++) to built-in primitives. A user will be able to alter this mapping using some external mechanism (e.g. annotations to map long values to Number). Standard mapping is listed in the table below:

Built-in	JavaC#	.NET	C++
Bitmask(n)	BitSet	byte[]
Int8	byte (Byte if nullable)	sbyte
Uint8	short with range constraints	byte
Int16	short (Short if nullable)	short
Uint16	int with range constratints	ushort
Int32	int (Integer if nullable)	int
Uint32	long with range constratints	uint
Int64	long (Long if nullable)	long
Uint64	BigInteger with range constratints	ulong
Float	float (Float if nullable)	float
Double	double (Double if nullable)	double
Number([n])	BigInteger	BigInteger
Decimal	BigDecimal	decimal
UUID	UUID	Guid
String	String	string
Date	LocalDate	NodaTime.LocalDate
Time	LocalTime	NodaTime.LocalTime
Datetime	LocalDateTime	NodaTime.LocalDateTime
Instant	Date (Instant?)	NodaTime.Instant
BLOB	byte[]	byte[]

Java has no native support for unsigned types. We still can introduce 'unsigned' flag to schema type or separate binary type-codes, and allow to map to the closest types of wider range. E.g. map Uint8 → short and recheck constraints during serialization.

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