【dateconv -i %W】ywd.c:475: __make_ywd_c: Assertion `w != DT_MIRACLEDAY' failed.

[NoSuck]

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Thank you for maintaining such useful software. Does the following demonstrate a bug?

■ uname -srvmo
Linux 5.0.0-arch1-1-ARCH #1 SMP PREEMPT Mon Mar 4 14:11:43 UTC 2019 x86_64 GNU/Linux
■ dateconv -V
dateconv 0.4.5
■ LC_ALL=C dateconv -i '%Y-%W' 2019-0
dateconv: ywd.c:475: __make_ywd_c: Assertion `w != DT_MIRACLEDAY' failed.
中止 (コアダンプ)