Gets a line-range from the buffer. Indexing is zero-based, end-exclusive. Negative indices are interpreted as length+1+index: -1 refers to the index past the end. So to get the last element use start=-2 and end=-1. Out-of-bounds indices are clamped to the nearest valid value, unless strict_indexing is set. Parameters: ~ {buffer} Buffer handle, or 0 for current buffer {start} First line index {end} Last line index (exclusive) {strict_indexing} Whether out-of-bounds should be an error. Return: ~ Array of lines, or empty array for unloaded buffer.