check in TODO

TODO

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+- impl backslash escapes
+- eval words
+- error handling
+- arithmatic
+- subst
+- standard argv -> name+switches+positionals helper
+
+==========================
+older
+==========================
+
+- Jest testing
+  - endekalogue
+
+...Lexing tokens?
+
+- \n or ;
+- [
+- ]
+- "
+- \
+- #
+- $
+- {
+- }
+- non-newline whitespace
+- other characters
+
+test cases:
+
+- intercommand whitespace, blank commands, ;;;,
+- braces, nested, escaped, continued newlines, other backslashes, text-after-closing-brace
+- trailing whitespace, for commands and scripts
+- backslash escapes
+
+  - types if magic:
+    - plain text
+    - charged/enchanted text (literal, not result of substitution or {} escape; decays to plain text when substituted)
+    - html text (never result of literal, established as "safe" as a whole; if combined with plain text, plain text is escaped to result in more html)
+      - TODO: should html text just be natural type?