Fix #41: Add explicit binary detection for PDF files #48
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Some PDF files were being incorrectly identified as text because they start with a text header (%PDF-)
This change adds a check in src/typecode/contenttype.py
if a file is initially detected as text, it now looks for a %PDF- signature and correctly sets it to binary if found.
i also added a regression test in tests/test_testcontenttype.py to cover this case
Fixes #41