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v2.0.0-alpha.5

Release v2.0.0-alpha.5
@Martin-Luther Martin-Luther tagged this 19 Apr 19:21 
Lockstep cut of @rhinostone/swig-core, @rhinostone/swig, and
@rhinostone/swig-twig at 2.0.0-alpha.5 under the `alpha` dist-tag.

Highlights since alpha.4:

  * @rhinostone/swig-core gains an IRVarRefExists IR node + backend
    emitter carrying a boolean defined-and-non-null signal for VarRef
    paths. Needed by Twig `is defined` / `is null` tests and by `??`
    undefined-fallback, both of which cannot use IRVarRef directly
    because emitVarRef coerces missing / null to "".
  * @rhinostone/swig-core backend now routes Twig/Jinja2 `??`
    undefined-fallback through IRVarRefExists for VarRef LHS, matching
    Twig-strict semantics (fallback on undefined OR missing property).
    Non-VarRef LHS (FnCall, FilterCall, Literal) falls through to bare
    `left??right` — those emitters do not coerce missing to "", so
    JS-native `??` is sufficient.
  * @rhinostone/swig-core backend now lowers Twig/Jinja2 `~` string-
    concat to (String(left) + String(right)). Bare `<left>~<right>`
    emission was JS unary bitwise-NOT and threw SyntaxError at compile
    time.
  * @rhinostone/swig-twig `is <test>` / `is not <test>` now routes
    through _ext._test_<name>(subject, ...args). VarRef subjects with
    `is defined` / `is null` special-case through IRVarRefExists to
    preserve the defined-or-not-null signal. Seven built-in test
    helpers (defined, null, empty, iterable, odd, even, divisibleby)
    ship at packages/swig-twig/lib/tests/ and register on every Twig
    instance via setExtension.
  * @rhinostone/swig-twig `..` range operator now lowers through
    _utils.range. swig-core adds range(start, end) with Twig-compatible
    inclusive-both-ends semantics for numeric + single-char-string
    bounds (ascending and descending).
  * @rhinostone/swig-twig parser now routes STRING and NUMBER literal
    LHS through parsePostfix, so filter chains like {{ "hi"|upper }}
    and {{ 42|json_encode }} parse correctly instead of bailing with
    Unexpected token "<filter>".
  * @rhinostone/swig-twig ships an end-to-end render-fixture suite at
    tests/swig-twig/cases/ (19 *.test.twig + .expectation.html pairs
    across operators, Twig-specific tags, filter semantics, and
    multi-template flows; 11 is-*, null-coalesce, and 3 range-*
    fixtures land alongside the Phase 4 work).

Cross-package runtime and peerDeps stay pinned to exact versions
(`"@rhinostone/swig-core": "2.0.0-alpha.5"`) — alpha-grade IR ABI is
unstable across minor bumps.
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