Whether bf16 storage holding offset positions converts under a conversion start of start tokens: once it holds at least start positions, and never while empty, so the first append is bf16 even when the start is 0.
offset
start
Whether bf16 storage holding
offsetpositions converts under a conversion start ofstarttokens: once it holds at leaststartpositions, and never while empty, so the first append is bf16 even when the start is 0.