* better tagging

* `glsl`: added `gl_PrimitiveID`
* SPIR-V: fixed `PrimitiveId` depending on raytracingNV rather than geometry capability

* support for hashing `Value`

* better tagging

* `Map`: added copy operator

* added `trap` and `debugtrap` intrinsics

* Capture: renamed the `self` argument to `this-capture`

* `type`: permit `<:` to use typenames

* capture: improve anchoring

* support for querying name and flags of globals

* renamed `writable?` to `mutable?`

* added `writable?` function to query if a pointer is mutable

* `dispatch` protocol accepts multiple switch arguments

* remove optimizations for modules

* fixed support for `compile-flag-dump-disassembly`

* reduce the compiler flags that invalidate cache

* use a special module flag to select native module compilation presets
* work compiler flags into the cache key

* LLVM: O0 performs dead code elimination and instruction combination by default
* LLVM: delay optimization until after module cache key has been built, so we only optimize once

* added `O0` compile flag (which appears to do nothing, currently)

* `switcher`: better parameter validation