self a well-formed Base64 entity ?
# Is `self` a well-formed Base64 entity ?
fun is_base64: Bool do return to_cstring.is_base64(byte_length)
lib/base64/base64.nit:233,2--234,64
redef fun is_base64 do return fast_cstring.is_base64(byte_length)
lib/base64/base64.nit:247,2--66