| Parameter | Description |
|---|---|
| fs | A FixedString"N"Bytes. |
| a | A byte to append. |
FormatError FormatError.None if successful. Returns FormatError.Overflow if the capacity of the string is exceeded.
Appends a byte to this string.
No validation is performed: it is your responsibility for the data to be valid UTF-8 when you're done appending bytes.