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class {{ opt.self_type.ffi_converter_name }}(_UniffiConverterRustBuffer):
@classmethod
def check_lower(cls, value):
if value is not None:
{{ opt.inner.ffi_converter_name }}.check_lower(value)
@classmethod
def write(cls, value, buf):
if value is None:
buf.write_u8(0)
return
buf.write_u8(1)
{{ opt.inner.ffi_converter_name }}.write(value, buf)
@classmethod
def read(cls, buf):
flag = buf.read_u8()
if flag == 0:
return None
elif flag == 1:
return {{ opt.inner.ffi_converter_name }}.read(buf)
else:
raise InternalError("Unexpected flag byte for optional type")