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Spiff compares the contents of file1 and file2 and prints a
description of the important differences between the files. White
space is ignored except to separate other objects. Spiff maintains
tolerances below which differences between two floating point numbers
are ignored. Differences in floating point notation (such as 3.4 3.40
and 3.4e01) are treated as unimportant. User specified delimited
strings (i.e. comments) can also be ignored. Inside other user
specified delimited strings (i.e. quoted strings) whitespace can be
significant.
Taken from a hint by Alan Barrett.
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