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* kernel: loaders never escape as an exception, date-spec validates on loadLukasz Kasprzak2026-08-111-2/+4
| | | | | | | | | | | | | | | | | | | | | | Layer.load narrowed its catch to Sexplib0.Sexp_conv_error.Of_sexp_error, but rank_of_sexp is caller-supplied and may raise anything -- e.g. a hand-written rank parser that calls invalid_arg. Overlay.load already catches every exception from the equivalent call; mirror that here so layer.mli's "never as an exception" promise actually holds. Date_spec.t derived its sexp converters with plain ppx_sexp_conv, unlike Slug and Lang, which hand-write validating parsers specifically so malformed data is rejected at load. (Fixed (month 13) (day 40)) used to deserialise cleanly into a spec that simply never resolves -- a saint quietly vanishing with no diagnostic. t_of_sexp now re-runs the value through the existing fixed validator, the same shape Slug and Lang already use. Covering tests: a Layer.load case where rank_of_sexp raises Invalid_argument instead of Of_sexp_error (would have escaped uncaught before this fix); two Date_spec.t_of_sexp cases (month 13, 31 April) that must raise Of_sexp_error rather than silently constructing an unresolvable spec.
* kernel(layer): sanctoral layer with canonical order and date indexLukasz Kasprzak2026-08-111-0/+56
Entries sort by slug so equal layers serialise identically. The by-date index is built once per layer rather than per year, since fixed dates are year-independent; a full-domain sweep would otherwise rescan every entry for every day. load turns parse and validation failures into result.