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Changes between Version 20 and Version 21 of StructuredBinaryData

-              v20
+              v21
    could pass the whole blob as a parameter and apply transforms to subblobs.
    This is essential for non‐sequential blobs like filesystems.
+ Infinite loop detection:: When decoding transforms like
+   `struct { if (.non_existent) { } }`, an infinite loop occurs. This can also
+   happen if the field exists, but in an outer `struct`. An error should be
+   printed instead; Bithenge should not try to look in the `if` when searching
+   for `.non_existent`.
  Complex expressions:: Expressions that use operators or call transforms.
+ Better error reporting:: errno.h is intended for system call errors; when
+   other errors occur, a more helpful error message should be printed, like
+   "field .foo not found" or "cannot apply nonzero_boolean to blobs".
  Assertions:: These could be implemented as transforms that don't actually
    change the input. There could be multiple levels, ranging from “warning” to
 …
  Enumerations:: An easier way to handle many constant values, like
    `enum { 0: "none", 1: "file", 2: "directory", 3: "symlink" }`.
+ Recursive transforms:: Although simple cases are handled by `do...while`, in
+   some cases transforms need to recursively refer to themselves or each other.
  Merge blobs and internal nodes:: Currently, `struct`, `repeat`, and so on only
    work with blobs, which must be either byte sequences or bit sequences.