v2.9.7
Internal: rename the FASTA lookup helper added in v2.9.6 from sequence_lookup_with_ens_fallback to lookup_sequence_with_version_fallback. The old name was misleading — both Ensembl and GENCODE IDs start with ENS; the actual fallback is to a version-stripped form, and the ENS-prefix check is just a guard against stripping non-Ensembl .N isoform suffixes. No public API change (helper isn't exported from pyensembl/__init__.py).