v1.8.1

Patch Changes

• 2073fd7: safeFetch refuses a header value with a character the runtime will not send inside it (a C0 control character but the tab, DEL, or one beyond Latin-1), a header name that is not a token, and headers that are not a record or a list of pairs (null among them) as INVALID_HEADER, naming the header and not the value, before any request or DNS lookup and without retrying. The runtime's own refusal quoted the whole value — usually a key — and a node's error output carried it into the run history. A value with a line break only at either end is still sent, as before (PO-752).