fn Buffer::capacity(self : Buffer) -> Int

fn Buffer::length(self : Buffer) -> Int

fn Buffer::new(capacity? : Int) -> Buffer

fn Buffer::to_wtf8(self : Buffer) -> Wtf8

fn Buffer::write_byte(self : Buffer, b : Byte) -> Unit raise Malformed

fn Buffer::write_bytes(self : Buffer, bytes : Bytes) -> Unit raise Malformed

fn Buffer::write_bytesview(self : Buffer, bytesview : BytesView) -> Unit raise Malformed

fn Buffer::write_codepoint(self : Buffer, codepoint : 
@tonyfettes/unicode/codepoint.CodePoint
CodePoint) -> Unit

fn Wtf8::codepoints(self : Wtf8) -> Iterator[
@tonyfettes/unicode/codepoint.CodePoint
CodePoint]

#as_free_fn
#alias(of_codeunits)
fn Wtf8::of_bytes(bytes : Bytes) -> Wtf8 raise Malformed

fn Wtf8::of_codepoints(cps : FixedArray[
@tonyfettes/unicode/codepoint.CodePoint
CodePoint]) -> Wtf8

#alias(codeunits)
fn Wtf8::to_bytes(self : Wtf8) -> Bytes

fn Wtf8::to_codepoints(self : Wtf8) -> FixedArray[Int]

fn Wtf8::to_utf8(self : Wtf8) -> 
@tonyfettes/utf8.Utf8
Utf8 raise 
@tonyfettes/utf8.Malformed
Malformed