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Fix/security optimization - #6
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If s2 points inside s1 (e.g. dstrappend(s, s + i)), dstrreserve() can realloc s1's buffer and invalidate s2 before the copy happens. Detect the aliasing before reserving and re-derive s2 from the new buffer.
dstrcat_base/dstrpush_base/dstrappend_base now grow capacity by 1.5x via _dstr_grow_cap() instead of reserving exactly what's needed, avoiding O(n^2) reallocations under repeated growth. dstrfind() now scans with memchr() for the first byte instead of memcmp()-ing at every position.
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