Description:
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Code 1 listed below does not work as expected. Code 2 does. Interesting bug. If I replace the "<= 0.01" with "< 0.02", it does work as expected.

Reproduce code:
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Code 1:
$data['low'] = 0.04;
$data['high'] = 0.05;

if ($data['high'] - $data['low'] <= 0.01)
	print "it works";

Code 2:
$data['low'] = 0.02;
$data['high'] = 0.03;

if ($data['high'] - $data['low'] <= 0.01)
	print "it works";

Expected result:
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Both instances should print "it works."

Actual result:
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Code 1 prints nothing.
Code 2 prints "it works".