encode64

Result!(size_t,  BidError) encode64(const  Bid64 v,
       return  scope  ubyte[]  dst)

@safe nothrow @nogc

Writes a decimal64 value as 8 big-endian bytes (non-committing).

`v`	the fields.
`dst`	caller-provided output buffer (≥ 8 bytes).

Result!(size_t, BidError): 8 on success; field errors as

documented on bitsOf64; INSUFFICIENT_CAPACITY leaves the buffer untouched.