Track this. It's been sitting around for too long.

doc/str-interface.md

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+Mostly copied from Python so far. Also see [this survey][survey].
+
+    alnum?
+    alpha?
+    capitalize
+    center width fillchar=" "
+    count sub start=0 end=len
+    decimal?
+    digit?
+    encode
+    ends-with suffix start=0 end=len
+    expand-tabs tabsize=8
+    find sub start=0 end=len
+    format format-string . args **kwargs
+    identifier?
+    index sub start=0 end=len
+    join seq
+    length # in characters
+    ljust width fillchar=" "
+    lower
+    lower?
+    lstrip chars=" \n"
+    numeric?
+    partition sep
+    printable?
+    replace old new count=nil
+    rfind sub start=0 end=len
+    rindex sub start=0 end=len
+    rjust width fillchar=" "
+    rpartition sep
+    rsplit sep=nil maxsplit=nil
+    rstrip chars=" \n"
+    size # in bytes
+    space?
+    split sep=nil maxsplit=nil
+    splitlines keepends=false
+    startswith prefix start=0 end=len
+    strip chars=nil
+    swapcase
+    title
+    title?
+    upper
+    upper?
+    width # in columns
+    zfill width
+
+[survey]:
+ http://merd.sourceforge.net/pixel/language-study/syntax-across-languages/Strng.html