name takes any byte a file name can hold, controls, edge blanks and bytes not UTF-8 included, so what name reads writes back as it was

A pane opened on a file whose name held a tab, a control byte or bytes
not UTF-8 read that name from its name file, and the same bytes written
back were refused. Only what no file name holds is refused now: a second
line and a NUL. The ctl word name still refuses a second blank after the
word, as a line's words are split at blanks.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 6 insertions, 4 deletions

diff --git a/docs/fs.md b/docs/fs.md
index d8324d47..c01587a1 100644
--- a/docs/fs.md
+++ b/docs/fs.md
@@ -407,10 +407,12 @@ no pane anywhere can give them.
 
 **`name`** reads the file name (a terminal's directory); a write renames the
 buffer (relative to the pane's directory) and marks nothing dirty; `Save`
-then writes under the new name. A name is one line; refused (EINVAL) are a
-second line, a blank at either end, control bytes and non-UTF-8 (`bad
-character in file name: a blank at its start`, ...). Up to 255 bytes a
-component. A directory (`/`, `~`, `foo/`) is no file name: refused, EISDIR
+then writes under the new name. A name takes any byte a file name can
+hold, blanks, control bytes and bytes not UTF-8 included, so what `name`
+reads writes back as it was; refused (EINVAL) are only a second line and a
+NUL (`bad character in file name: a NUL`). Up to 255 bytes a component.
+The ctl word `name x` takes all after its one blank; a second blank there
+is refused rather than read as the name's first byte. A directory (`/`, `~`, `foo/`) is no file name: refused, EISDIR
 (`name: /home/u is a directory, not a file`).
 
 **`body`** reads the text; a write appends; `>` (OTRUNC) replaces it all.