overlap default strandedness argument incorrectly documented

[cmatKhan]

In the documentation of overlap, this is how the strandedness argument is defined:

strandedness ({None, "same", "opposite", False}, default None, i.e. auto) – Whether to compare PyRanges on the same strand, the opposite or ignore strand information. The default, None, means use “same” if both PyRanges are strande, otherwise ignore the strand information.

However, it seems that the default behavior is not strandedness='same'. I may be misunderstanding the docs, but that wasn't what I expected. This may be related to #356.

Example data: The two GTF files contain the following ranges:
test_1_gtf.txt
test_2_gtf.txt

chr1	unknown	transcript	1	25	.	+	.	gene_id "gene1"; transcript_id "transcript_1";
chr1	unknown	transcript	1	25	.	-	.	gene_id "gene1"; transcript_id "transcript_1";

x = pr.read_gtf('text_1_gtf.txt')
y = pr.read_gtf('text_2_gtf.txt')

x.overlap(y)

	Chromosome	Source	Feature	Start	End	Score	Strand	Frame	gene_id	transcript_id
0	chr1	unknown	transcript	0	25	.	+	.	gene1	transcript_1

x.overlap(y,strandedness='opposite')

	Chromosome	Source	Feature	Start	End	Score	Strand	Frame	gene_id	transcript_id
0	chr1	unknown	transcript	0	25	.	+	.	gene1	transcript_1

x.overlap(y,strandedness='same')

# empty result

pyranges version info:

{'pyranges version': '0.0.120', 'pandas version': '1.5.2', 'numpy version': '1.23.0', 'python version': sys.version_info(major=3, minor=9, micro=18, releaselevel='final', serial=0), 'ncls': '0.0.65', 'sorted_nearest': '0.0.37', 'pyrle': '0.0.35', 'ray': 'not installed', 'bamread': 'not installed', 'pyranges_db': 'not installed', 'pybigwig': 'not installed', 'hypothesis': 'not installed'}