Create minimum buffer required for OpenRead #47958
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LazyLoadingReadOnlyStream, when not specified an explicit buffer size, always selects 4MB as the buffer size. This is unnecessary if the underlying blob size (which comes in as initialLength) is smaller than that AND the blob does not allow modifications (meaning the blob will never grow any larger). In this case, the buffer size can simply be initialized to the length of the blob that will be read.
rlrossiter
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LazyLoadingReadOnlyStream, when not specified an explicit buffer size, always selects 4MB as the buffer size. This is unnecessary if the underlying blob size (which comes in as initialLength) is smaller than that AND the blob does not allow modifications (meaning the blob will never grow any larger). In this case, the buffer size can simply be initialized to the length of the blob that will be read.
Fixes #47821