io/fs.FS for input files. #4200
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Closes #3954. Adds
InputFS io/fs.FSwhich allows the caller to provide a filesystem that input files will be read from.Though it actually uses
internal/io_fsbecause importingio/fswould break compatibility with versions earlier than Go 1.16. The shim for earlier versions is not intended to be implementable; if a caller wishes to pass in anio/fs.FS, that caller should use Go 1.16 or newer.