diff --git a/libs/main/core/picli.h b/libs/main/core/picli.h
index 4bb0073c..5a71db20 100644
--- a/libs/main/core/picli.h
+++ b/libs/main/core/picli.h
@@ -135,7 +135,7 @@ public:
 	//! \~russian Возвращает короткий ключ аргумента "name" или пустую строку, если аргумента нет.
 	PIString argumentShortKey(const PIString & name) {
 		piForeach(Argument & i, _args)
-			if (i.name == name) return i.short_key;
+			if (i.name == name) return PIString(i.short_key);
 		return PIString();
 	}
 
diff --git a/libs/main/io_devices/piusb.h b/libs/main/io_devices/piusb.h
index c80a059b..839f2382 100644
--- a/libs/main/io_devices/piusb.h
+++ b/libs/main/io_devices/piusb.h
@@ -175,11 +175,11 @@ public:
 
 	void setVendorID(ushort vid) {
 		vid_ = vid;
-		setPath(PIString::fromNumber(vid_, 16).expandLeftTo(4, "0") + ":" + PIString::fromNumber(pid_, 16).expandLeftTo(4, "0"));
+		setPath(PIString::fromNumber(vid_, 16).expandLeftTo(4, '0') + ':' + PIString::fromNumber(pid_, 16).expandLeftTo(4, '0'));
 	}
 	void setProductID(ushort pid) {
 		pid_ = pid;
-		setPath(PIString::fromNumber(vid_, 16).expandLeftTo(4, "0") + ":" + PIString::fromNumber(pid_, 16).expandLeftTo(4, "0"));
+		setPath(PIString::fromNumber(vid_, 16).expandLeftTo(4, '0') + ':' + PIString::fromNumber(pid_, 16).expandLeftTo(4, '0'));
 	}
 
 	bool setConfiguration(uchar value);
diff --git a/libs/main/text/pichar.h b/libs/main/text/pichar.h
index 22977c2f..2d39742a 100644
--- a/libs/main/text/pichar.h
+++ b/libs/main/text/pichar.h
@@ -59,7 +59,7 @@ public:
 
 	//! \~english Contructs symbol from system locale and no more than 4 bytes of string
 	//! \~russian Создает символ из системной локали не более 4 байт длины
-	PIChar(const char * c, int * bytes = 0);
+	explicit PIChar(const char * c, int * bytes = 0);
 
 	//! \~english Copy operator
 	//! \~russian Оператор присваивания
@@ -81,7 +81,7 @@ public:
 
 	//! \~english Compare operator
 	//! \~russian Оператор сравнения
-	bool operator!=(const PIChar & o) const { return !(o == *this); }
+	bool operator!=(const PIChar & o) const { return !(*this == o); }
 
 	//! \~english Compare operator
 	//! \~russian Оператор сравнения
@@ -265,36 +265,36 @@ inline bool operator<=(const char * v, const PIChar & c) {
 //! \relatesalso PIChar
 //! \~english Compare operator
 //! \~russian Оператор сравнения
-inline bool operator==(const int v, const PIChar & c) {
-	return (PIChar((ushort)v) == c);
+inline bool operator==(ushort v, const PIChar & c) {
+	return (PIChar(v) == c);
 }
 
 //! \relatesalso PIChar
 //! \~english Compare operator
 //! \~russian Оператор сравнения
-inline bool operator>(const int v, const PIChar & c) {
-	return (PIChar((ushort)v) > c);
+inline bool operator>(ushort v, const PIChar & c) {
+	return (PIChar(v) > c);
 }
 
 //! \relatesalso PIChar
 //! \~english Compare operator
 //! \~russian Оператор сравнения
-inline bool operator<(const int v, const PIChar & c) {
-	return (PIChar((ushort)v) < c);
+inline bool operator<(ushort v, const PIChar & c) {
+	return (PIChar(v) < c);
 }
 
 //! \relatesalso PIChar
 //! \~english Compare operator
 //! \~russian Оператор сравнения
-inline bool operator>=(const int v, const PIChar & c) {
-	return (PIChar((ushort)v) >= c);
+inline bool operator>=(ushort v, const PIChar & c) {
+	return (PIChar(v) >= c);
 }
 
 //! \relatesalso PIChar
 //! \~english Compare operator
 //! \~russian Оператор сравнения
-inline bool operator<=(const int v, const PIChar & c) {
-	return (PIChar((ushort)v) <= c);
+inline bool operator<=(ushort v, const PIChar & c) {
+	return (PIChar(v) <= c);
 }
 
 #endif // PICHAR_H
diff --git a/libs/main/text/pistring.h b/libs/main/text/pistring.h
index 2a3f7d28..e81fa4d1 100644
--- a/libs/main/text/pistring.h
+++ b/libs/main/text/pistring.h
@@ -113,11 +113,11 @@ public:
 
 	//! \~english Contructs string with single character "c".
 	//! \~russian Создает строку из одного символа "c".
-	PIString(const PIChar c) { d.push_back(c); }
+	explicit PIString(const PIChar c) { d.push_back(c); }
 
 	//! \~english Contructs string with single character "c".
 	//! \~russian Создает строку из одного символа "c".
-	PIString(const char c) { d.push_back(PIChar(c)); }
+	explicit PIString(const char c) { d.push_back(PIChar(c)); }
 
 	//! \~english Contructs string from C-string "str" (system codepage).
 	//! \~russian Создает строку из C-строки "str" (кодировка системы).
@@ -145,7 +145,7 @@ public:
 
 	//! \~english Contructs string from byte array "ba" (as UTF-8).
 	//! \~russian Создает строку из байтового массива "ba" (как UTF-8).
-	PIString(const PIByteArray & ba) { *this += ba; }
+	explicit PIString(const PIByteArray & ba) { *this += ba; }
 
 	//! \~english Contructs string from "len" characters of buffer "str".
 	//! \~russian Создает строку из "len" символов массива "str".
@@ -181,7 +181,7 @@ public:
 			d.push_back(c);
 	}
 
-	PIString(const PIConstChars & c) { *this += c; }
+	explicit PIString(const PIConstChars & c) { *this += c; }
 
 	~PIString();
 
@@ -1184,15 +1184,6 @@ public:
 	//! \endcode
 	int entries(const PIChar c) const;
 
-	//! \~english Returns number of occurrences of character "c".
-	//! \~russian Возвращает число вхождений символа "c".
-	//! \~\details
-	//! \~\code
-	//! piCout << PIString(".str.0").entries('.'); // 2
-	//! piCout << PIString(".str.0").entries('0'); // 1
-	//! \endcode
-	int entries(char c) const { return entries(PIChar(c)); }
-
 	//! \~english Returns if string starts with "str".
 	//! \~russian Возвращает начинается ли строка со "str".
 	bool startsWith(const PIString & str) const;
diff --git a/tests/core/pistringTest.cpp b/tests/core/pistringTest.cpp
index 4597c157..981e373b 100644
--- a/tests/core/pistringTest.cpp
+++ b/tests/core/pistringTest.cpp
@@ -12,7 +12,7 @@ TEST(PIString_Tests, constructor_empty) {
 
 TEST(PIString_Tests, operator_concatenation_pichar) {
 	PIString str1     = "AB C";
-	const PIChar str2 = " ";
+	const PIChar str2 = ' ';
 	str1 += str2;
 	PIString res = "AB C ";
 	ASSERT_EQ(str1, res);
@@ -20,7 +20,7 @@ TEST(PIString_Tests, operator_concatenation_pichar) {
 
 TEST(PIString_Tests, operator_concatenation_pichar_zero1) {
 	PIString str1     = "";
-	const PIChar str2 = "D";
+	const PIChar str2 = 'D';
 	str1 += str2;
 	ASSERT_EQ(str1, "D");
 }
@@ -120,7 +120,7 @@ TEST(PIString_Tests, construct_pistring) {
 TEST(PIString_Tests, construct_pistring_move) {
 	PIString str1 = "New";
 	PIString res  = str1;
-	PIString str(move(str1));
+	PIString str(std::move(str1));
 	ASSERT_EQ(res, str);
 }
 
@@ -192,14 +192,14 @@ TEST(PIString_Tests, operator_assignment) {
 TEST(PIString_Tests, operator_assignment_move) {
 	PIString str1 = "testing";
 	PIString str;
-	str = move(str1);
+	str = std::move(str1);
 	ASSERT_EQ(PIString("testing"), str);
 	ASSERT_TRUE(str1.isEmpty());
 }
 
 TEST(PIString_Tests, operator_symbol) {
 	PIString str1 = "testing";
-	PIChar symbo  = "i";
+	PIChar symbo  = 'i';
 	ASSERT_EQ(symbo, str1[4]);
 }
 
@@ -217,13 +217,13 @@ TEST(PIString_Tests, operator_equal_pistring_false) {
 
 TEST(PIString_Tests, operator_equal_pichar_true) {
 	PIString str1 = "t";
-	PIChar str2   = "t";
+	PIChar str2   = 't';
 	ASSERT_TRUE(str1 == str2);
 }
 
 TEST(PIString_Tests, operator_equal_pichar_false) {
 	PIString str1 = "t";
-	PIChar str2   = "p";
+	PIChar str2   = 'p';
 	ASSERT_FALSE(str1 == str2);
 }
 
@@ -253,13 +253,13 @@ TEST(PIString_Tests, operator_not_equal_pistring_true) {
 
 TEST(PIString_Tests, operator_not_equal_pichar_false) {
 	PIString str1 = "t";
-	PIChar str2   = "t";
+	PIChar str2   = 't';
 	ASSERT_FALSE(str1 != str2);
 }
 
 TEST(PIString_Tests, operator_not_equal_pichar_true) {
 	PIString str1 = "t";
-	PIChar str2   = "p";
+	PIChar str2   = 'p';
 	ASSERT_TRUE(str1 != str2);
 }
 
@@ -295,19 +295,19 @@ TEST(PIString_Tests, operator_less_pistring_false_equal) {
 
 TEST(PIString_Tests, operator_less_pichar_true) {
 	PIString str1 = "a";
-	PIChar str2   = "t";
+	PIChar str2   = 't';
 	ASSERT_TRUE(str1 < str2);
 }
 
 TEST(PIString_Tests, operator_less_pichar_false) {
 	PIString str1 = "t";
-	PIChar str2   = "a";
+	PIChar str2   = 'a';
 	ASSERT_FALSE(str1 < str2);
 }
 
 TEST(PIString_Tests, operator_less_pichar_false_equal) {
 	PIString str1 = "t";
-	PIChar str2   = "t";
+	PIChar str2   = 't';
 	ASSERT_FALSE(str1 < str2);
 }
 
@@ -349,19 +349,19 @@ TEST(PIString_Tests, operator_grater_pistring_false_equal) {
 
 TEST(PIString_Tests, operator_grater_pichar_true) {
 	PIString str1 = "t";
-	PIChar str2   = "a";
+	PIChar str2   = 'a';
 	ASSERT_TRUE(str1 > str2);
 }
 
 TEST(PIString_Tests, operator_grater_pichar_false) {
 	PIString str1 = "a";
-	PIChar str2   = "t";
+	PIChar str2   = 't';
 	ASSERT_FALSE(str1 > str2);
 }
 
 TEST(PIString_Tests, operator_grater_pichar_false_equal) {
 	PIString str1 = "t";
-	PIChar str2   = "t";
+	PIChar str2   = 't';
 	ASSERT_FALSE(str1 > str2);
 }
 
@@ -403,19 +403,19 @@ TEST(PIString_Tests, operator_less_eq_pistring_true_equal) {
 
 TEST(PIString_Tests, operator_less_eq_pichar_true) {
 	PIString str1 = "a";
-	PIChar str2   = "t";
+	PIChar str2   = 't';
 	ASSERT_TRUE(str1 <= str2);
 }
 
 TEST(PIString_Tests, operator_less_eq_pichar_false) {
 	PIString str1 = "t";
-	PIChar str2   = "a";
+	PIChar str2   = 'a';
 	ASSERT_FALSE(str1 <= str2);
 }
 
 TEST(PIString_Tests, operator_less_eq_pichar_true_equal) {
 	PIString str1 = "t";
-	PIChar str2   = "t";
+	PIChar str2   = 't';
 	ASSERT_TRUE(str1 <= str2);
 }
 
@@ -457,19 +457,19 @@ TEST(PIString_Tests, operator_grater_eq_pistring_true_equal) {
 
 TEST(PIString_Tests, operator_grater_eq_pichar_true) {
 	PIString str1 = "t";
-	PIChar str2   = "a";
+	PIChar str2   = 'a';
 	ASSERT_TRUE(str1 >= str2);
 }
 
 TEST(PIString_Tests, operator_grater_eq_pichar_false) {
 	PIString str1 = "a";
-	PIChar str2   = "t";
+	PIChar str2   = 't';
 	ASSERT_FALSE(str1 >= str2);
 }
 
 TEST(PIString_Tests, operator_grater_eq_pichar_true_equal) {
 	PIString str1 = "t";
-	PIChar str2   = "t";
+	PIChar str2   = 't';
 	ASSERT_TRUE(str1 >= str2);
 }
 
diff --git a/utils/deploy_tool/main.cpp b/utils/deploy_tool/main.cpp
index afa4421b..4a5e2c07 100644
--- a/utils/deploy_tool/main.cpp
+++ b/utils/deploy_tool/main.cpp
@@ -20,7 +20,6 @@
 #include "picli.h"
 #include "pidir.h"
 #include "piiostream.h"
-#include "piprocess.h"
 
 #define DELIM "::"
 
@@ -251,7 +250,7 @@ void checkQtLib(PIString lib) {
 	for (int i = 0;; ++i) {
 		if (qt_deps[i].lib.isEmpty()) break;
 		if (qt_deps[i].lib == base) {
-			qt_plugins << qt_deps[i].plugins;
+			qt_plugins << PISet<PIString>(qt_deps[i].plugins);
 			// piCout << "add qt plugins" << qt_deps[i].plugins << "now" << qt_plugins;
 			need_qt = true;
 			qt_libs << lib;
@@ -269,8 +268,8 @@ void checkQtLib(PIString lib) {
 void procLdd(PIString file, bool ext_lib = false, int cur_depth = 0) {
 	++cur_depth;
 	if (cur_depth > depth) return;
-	static PIStringList ignore_ext = {"png",      "jpg", "jpeg", "gif",  "bmp", "svg",  "tif",  "tiff", "ico",  "pdf",
-									  "txt",      "cfg", "conf", "json", "qml", "glsl", "fraq", "vert", "geom", "qmltypes",
+	static PIStringList ignore_ext = {"png",      "jpg", "jpeg", "gif",  "bmp", "svg",  "tif",  "tiff", "ico",   "pdf",
+									  "txt",      "cfg", "conf", "json", "qml", "glsl", "fraq", "vert", "geom",  "qmltypes",
 									  "metainfo", "ts",  "qm",   "ttf",  "htm", "html", "md",   "sms",  "smsee", "blockmodel"};
 	PIString ext                   = PIFile::FileInfo(file).extension();
 	if (ignore_ext.contains(ext.toLowerCase())) return;
@@ -615,7 +614,7 @@ int main(int argc, char * argv[]) {
 	out_dir     = cli.argumentValue("output");
 	lib_dirs    = cli.argumentValue("search_path").split(DELIM);
 	add_libs    = cli.argumentValue("add_libs").split(DELIM);
-	ignore_libs = cli.argumentValue("ignore").split(DELIM);
+	ignore_libs = PISet<PIString>(cli.argumentValue("ignore").split(DELIM));
 	qt_dir      = cli.argumentValue("qtdir");
 	ldd         = cli.argumentValue("ldd");
 	readelf     = cli.argumentValue("Lreadelf");