openbim-step 0.9.0

Changed (breaking)

The owned model is reshaped to allocate less; parse output is unchanged in
content (canonical dumps identical to 0.8.0 on 4,316 files, strict and
recovering, writer output included). On three files, owned parse against
0.8.0 (user cycles, drop included): peak memory -28% (109 MB Revit IFC,
600 -> 431 MB), -34% (IFC4X3 with large coordinate lists), -32% (97 MB AP214);
cycles -23%, -18%, -30%. Heap allocations for the Revit model 7.5 M -> 2.6 M.

• Str is the owned model's string and the new default for every S
  (Exchange, DataRecord, Record, HeaderRecord, Parameter,
  Event, EventSink), replacing String. Values of up to 22 bytes --
  nearly every number, GUID and entity name -- are stored inline without an
  allocation; longer ones are one shared Arc<str>, and parse allocates
  each distinct long name (record, typed-value and enumeration names) once
  per parse and shares it. Str derefs to str, compares equal to &str,
  and converts from &str, String and Arc<str>. The borrowed APIs keep
  Cow<'a, str> and do no interning.
• DataRecord { id, records: Vec<Record> } is now
  DataRecord { id, instance: Instance } with
  Instance::Simple(Record) / Instance::Complex(Box<[Record]>): a simple
  instance holds its record inline instead of in a one-element Vec.
  DataRecord::records() returns the records as a slice for either shape;
  as_simple() now returns Some only for the simple form. New
  constructor DataRecord::complex.
• A complex instance stays complex: #1=(A(1)); now writes back as
  written, where the writer used to turn a one-record complex instance into
  #1=A(1);. An empty Instance::Complex is refused by the writer.
• Parameter lists are Box<[Parameter]> instead of Vec<Parameter>
  (Record::parameters, HeaderRecord::parameters, Parameter::List): a
  list never grows after parsing, so it carries no capacity. Constructors
  (Record::new, DataRecord::simple) accept anything Into<Box<[_]>>,
  including a Vec or an array.

Migrating: read record.records() instead of record.records; build text
with Str::from(..) or .into(); consume a boxed list by value with
.into_vec() (edition 2021's .into_iter() on a Box<[T]> iterates by
reference); compare names with name == "IFCWALL" or &*name.