pub fn pubmed_allowlist() -> Vec<SourceAllowlist>Expand description
Always-compiled allowlist for PubMed id resolution (#500, ADR-0061):
a PMID / PMCID is turned into its DOI by NCBI E-utilities. Not a fetch
source either – it answers “which DOI is this”, never with content – so
it stays out of tier_1_allowlist and out of every fetch plan.