Improve S3 read performance. Fix #152 #157
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The previous implementation performed a .get every time when reading to the buffer. This was wasteful and unnecessary. A single .get is sufficient to read from the current position until the end of the file. Another .get is only necessary when seeking.
This matches the behavior of 1.5.3 more closely, as observed during live tests against S3.
menshikh-iv
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This PR improves the speed of reading from S3. It fixes #152 (performance regression from release 1.5.4).