Module varint 

LEB128 varints and zigzag signed integers.

Functions

len_u64

Bytes write_u64 uses for v.

read_i64

read_u64

Read an unsigned LEB128 varint and advance bytes past it. None when it is truncated or longer than 10 bytes.

write_i64

Append a signed integer as a zigzag varint (small magnitudes are short).

write_u64

Append v as an unsigned LEB128 varint (1 to 10 bytes).