`byte-code', `extents', `gc', `glyphs', `malloc', and
`typecheck'. The default value is `none'.
--use-union-type (Bool) Define Lisp_Object as a union, not an int.
- Provides stricter type-checking. System-dependent.
+ Use for strict _static_ type-checking. Implicated in
+ system-dependent, hard-to-debug crashes. See PROBLEMS.
+ Do NOT use in production builds.
--no-doc-file (Bool) Don't rebuild the DOC file unless it's missing.
Only use during development.
--quick-build (Bool) Don't GC when dumping. Implies `--no-doc-file'.