Error: number out of range:

[AntonioFS]

Thank you for your response.

In the following examples, only uint32 and uint4 produce the overflow error. 
Why?

Best regards. Antonio F.S.

let uintLit: uint = 42; let uintLitBis = 42'u

let uint8Lit: uint8 = 255; let uint8LitBis = 255'u8

let uint16Lit: uint16 = 65535; let uint16LitBis = 65535'u16

let uint32Lit: uint32 = 4294967295; let uint32LitBis = 4294967295'u32

let uint64Lit: uint64 = 18446744073709551615; let uint64LitBis = 
18446744073709551615'u64