Bug: GUIDerator error message says 20 < size <= 36 but 20 is actually a valid size
The GUIDerator class accepts sizes between 20 and 36 inclusive (the guard is if size < 20 or size > 36), and the docstring confirms this. However, the ValueError raised for out-of-range sizes says expected 20 < size <= 36, which incorrectly implies that size=20 is invalid.
This inconsistency becomes apparent when you check the error message for an invalid size:
from boltons.iterutils import GUIDerator
# size=20 is accepted without error (correct behavior)
g = GUIDerator(size=20)
print(len(next(g))) # prints 20
# but passing size=19 raises a misleading error message
try:
GUIDerator(size=19)
except ValueError as e:
print(e) # prints: expected 20 < size <= 36
The error message expected 20 < size <= 36 is wrong — it suggests 20 is not a valid size, but GUIDerator(size=20) works fine. The message should say expected 20 <= size <= 36 to accurately reflect the inclusive lower bound.
Expected behavior: When an out-of-range size like 19 or 37 is passed, the ValueError message should read expected 20 <= size <= 36.
Actual behavior: The message reads expected 20 < size <= 36, which contradicts both the actual validation logic and the documented valid range.
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