jallum / iodata / 107472a678e7a10e5ce7be935b7a198d5dc9925b

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BugFix: List impl now errors on out-of-range split/to_iodata; improved coverage to 99.5%

The List implementation silently returned truncated data when asked for
more bytes than the iolist contains: split/2 on overrun returned an ok
tuple with the partial prefix, and to_iodata/3 (thus to_binary/3 and
slice) returned the partial range. Both now return
{:error, :insufficient_data}, matching the protocol contract and the
BitString implementation. Also fixed split!/2, to_iodata!/3, and
to_binary!/3, which crashed with a KeyError when raising because
ArgumentError has no :term field.

Added targeted unit tests across all implementations for the paths the
property tests never reached (error/raise branches, size, slice, file
edge cases, improper iolists), taking coverage from 57.2% to 99.5% and
making it stable across test seeds.

Claude-Session: https://claude.ai/code/session_012n42ePqYGM2v2e325fh5m2

13 of 13 new or added lines in 1 file covered. (100.0%)

212 of 213 relevant lines covered (99.53%)

172.08 hits per line