mongolstats

• **Retries no longer crash on the first backoff**: the default retry backoff formula referenced ..attempt, which does not exist in rlang lambdas (the argument is .x), so any transient response (429/503) failed with "object '..attempt' not found" instead of retrying.
• **HTTP error and verbose messages now include the request URL**: an internal misuse of httr2::req_url() as a getter meant the URL always rendered as NA and was dropped from messages.
• **Time columns typed "t" are handled**: the PXWeb response flattener kept only "d"-typed columns; a server typing its time column "t" (the PXWeb convention; NSO currently uses "d") would have misaligned row keys with column names.
• **nso_fetch() now honors the mongolstats.default_labels option**, matching nso_data().
• **nso_itms_search() matches its query literally** as documented ("keyword"); regex metacharacters (e.g. "c++") no longer error. nso_search() remains a regex search.
• **nso_period_seq() rejects trailing garbage** after a valid year (e.g. "2024abc", "2024-06"); previously the year prefix was silently used.
• **mn_join_by_name() and mn_fuzzy_join_by_name() error clearly** when name_col is not a column of data, instead of failing with an obscure replacement-length error.
• **nso_table_periods() finds the time dimension for lang = "mn"** by also matching the Mongolian display name.
• **Mixed codes and labels**: Selection values are now mapped element-wise, so codes and labels can be mixed in one vector (e.g. Sex = c("Total", "1")). Previously this produced an "Unknown value: NA" error. Duplicated labels in table metadata now produce a warning naming the ambiguous label.
• **Consistent errors**: as_px_query() now raises the same classed errors as nso_data() for invalid selections (previously a plain stop()).
• **Correct error classes**: network failures (DNS, timeout) now signal mongolstats_http_error; previously they were misclassified as mongolstats_offline_error, so handlers could not tell offline mode from a genuine connection problem.

Performance

• The PXWeb session cookie is now seeded once per base URL per session instead of once per data fetch, removing one GET round trip from every nso_data() call after the first.
• mn_fuzzy_join_by_name() no longer computes a base-R distance matrix that was immediately discarded when stringdist is installed.

CRAN compliance

• The cache test no longer writes to (or clears) the user's real cache directory: it now skips when the cache packages are missing and uses a throwaway directory under tempdir(). Previously it ran on CRAN and touched rappdirs::user_cache_dir("mongolstats").
• The nso_cache_enable() example is now conditional on memoise/cachem/rappdirs being installed.
• Network-dependent examples are now guarded with NOT_CRAN in addition to curl::has_internet(), so they no longer contact the live PXWeb API during CRAN checks. The nso_rebuild_px_index() example, which crawls the full catalogue, is wrapped in \dontrun{}.
• inst/extdata/air_monthly_cached.csv is now gzip-compressed (6.4 Mb to 0.3 Mb), bringing the installed package size well under CRAN's threshold. read.csv() decompresses it transparently; only the vignette referenced it.

Internal

• Removed the unused legacy HTTP layer (.nso_req(), .nso_get(), .nso_post() and friends) together with the now-inert mongolstats.base_url option; all requests go to the PXWeb API base (mongolstats.px_base_url).
• nso_search() and nso_itms_search() share one search helper; the PXWeb response flattener was factored into .px_flatten_response() and unit-tested; the mongolstats.parallel option is now registered and reported by nso_options().
• The GeoBoundaries metadata request now uses the same timeout/retry policy as other requests.
• Selection mapping and validation consolidated into a single helper (.px_map_selections()), removing three divergent copies of the logic.
• Table resolution now goes through .px_resolve_table() everywhere (.px_add_labels(), nso_table_periods(), .px_build_body()), removing the remaining inlined index lookups.
• Integration tests resolve dimension codes from live metadata instead of assuming positional codes, so tests no longer break when NSO adds a new period. Integration and endpoint tests now assert concrete shapes and no longer swallow errors.
• Added tools/record_fixtures.R to record the httptest2 fixtures used by test-recorded-*.R; those tests previously always skipped because the fixture directories were empty.
• Removed unused globalVariables() declarations, the unused lifecycle Suggests entry, and a stray rendered vignette HTML from the repository.